IBS - Parasite - IBS - Probiotic???

I hope to make this as short as possible...   My daughter (now 21 1/2 yrs old) got food poisoning on Aug 8 2011.   Severe stomach cramps, nausea, diarrhea, several visits to doctor with antibiotics, steroid shots and several ER visits for a 2 week period.   Started to get a little better, then it started again but with severe constipation.   First like 3x a week then slowly until it was every day.   Went to a GI doctor in the meantime (mid Sept), did a colonoscopy, endoscopy and was told IBS.   Went gluten free, lactose free and tried an IBS diet, nothing seemed to help - it really didn't matter what she ate.   She couldn't even get off the couch she was sick 24/7.   This still continued thru mid Dec. Symptoms worse - with extreme hot flashes and ear aches now added to the symptoms.     She lost 1/4 her body weight, started losing her hair.   Had another GI Dr appt with a new Dr.   He said he didn't think it was IBS, so he ran tests - no to Celiac - No to Chrohns, stools tests, barium test for small intestine function. - he still said not IBS and sent her to a GI Dr at a teaching hospital that would be able to tests for more things.   This Dr also said no to IBS, so she was running tests.   My daughter went in the hospital for 9 days on Feb 2, 2012.   Another colonoscopy - tests every day, stool tests, urine, blood, more barium, x-rays, MRI.   Two GI Drs that saw her in the hospital said it was IBS she would have to learn to live with it.   (her Dr was not on call at the hospital when my daughter was there - she was out of town).   (This just goes to show you the different opinions doctors have, even in the same office!)  Went to Dr after hospital - Dr said if she can't get more calories in her she would put a feeding tube in.   (She was living on chicken, green beans, plain rice and applesauce and Ensure - Ensure kept her alive)   Her Dr said she wanted to do a partial colonoscopy in the office if nothing showed on biopsies then she would do another full colonoscopy.   nothing showed - full colonoscopy on March 2, 2012 - found a Parasite !   Dr wasn't sure what kind - treated her with different meds over the next 2 months on and off (2 types - 3 days each - one type was taken twice).   She felt really good, after the last one, for about 3 weeks.   I didn't believe parasite was gone, had doctor do 6 day stool sample, nothing showed up.   Then she had her period and right back to nausea, stomach cramps, ect..   (never had problems with her period before). (I do thank God everyday for this GI Dr - if it wasn't for her, I don't just don't know). Today her symptoms come and sometimes go.   She is usually fine in the morning and then once she eats she slowly starts feeling bad - cramp, nausea and constipation.   She was last year diagnosed with SIBO - treated, really didn't feel any different.   She has since been diagnosed with Many yeast in her stool and put on Nystatin.   Became severally constipated, cramping bloated, nausea so she went off it.   Her GI doctor last year prescribed her Florstor, but only because I asked for a probiotic - the Dr didn't believe in them     They didn't help at the time. probably because of the parasite.   Took her to a holistic Dr and he prescribed a probiotic that has 40 billion in it - I had her take Culturelle first for a week and then she took one of the Dr's but it made her cramp, indigestion and pooped 3x's.   So I guess  I don't know what to do.   Parasite - No Parastie - IBS no IBS -   (I do think and pray the parastie is gone, because even though she isn't 100% she is still 10,000 x better than one year ago).   I know probiotics are good - but which one - try the Florstor - stick with the 40 billion one, try a new one, what? And when and how to take?   I have lost all faith in Dr's and I am tired of trying to play Dr myself. (I should have in my name "tiredofbingdr"!)   tiredofbeingdr

Sherry - thanks for your reply.
That was the same questions I had to the Dr. Her and another Dr saw it and said it was a tapeworm. So they put her on meds. The first wrong really didn't do anything. So three weeks later they did another round and she was aite better for about 3 days. The I comained about the type of meds for the right parasite so they treated her for a different type. They were suppose to do one round and then 2 weeksater do another round. But my daughter was doing so good at the 2 week mark that the doctor decided she didn't need it. She did good for another week and then fell off the cliff. The doctor swore up and down that the parasite is gone but it is something else. She said something else is going on and that they just happened upon the parasite. It is very frustrating because I don't know what to believe. She is better than she was but why was she good for 3 weeks and then, boom.
I understand the probiotic but I know I won't be able to talk her into something that makes her worse for two weeks. Another problem is that those are her symptoms to start with along with indegestion and nausea. She seems to be able to handle Culturelle and Florstor with no problems.
Another things is her Dr has her on Nortriptene (a depression med), it deadens the nerve endings so as food passes thru she doesn't feel it as much. So my concern on this is that it hides the symptoms, so how bad would she really be hurting.