Not diagnosed yet.....need some help

Five days ago I had a solid bowel movement followed by 5 hours of having the urgency to go poop but nothing really coming out. I would get the urgency about once an hour and by the 2nd or 3rd hour the only thing coming out was a mucus mixed with blood. During the 5 hour process I sat on the toilet about 5 times and by the 3rd time it was extreme pain feeling like something was tearing as I was pushing.

Since five days ago this has now happened three times (with the third time being today) where I have a solid bowel movement (no blood, no pain) followed by a number of hours of feeling like I need to go with nothing coming out. After the first episode five days ago (Thursday) I did not go until Saturday which was another episode, and then after Saturday I have not had a bowel movement until today (Tuesday). Today I had a normal bowel movement but having the urgency to go again within an hour of the bowel movement.

Yesterday I saw my family doctor who did not have too much to say and today I'm seeing a GI specialist. Since five days ago I've been very careful about my diet, mostly sticking to the B.R.A.T. diet because initially I thought this was a stomach bug. At no point through this process have I had any diarrhea. I have dealt with hemorrhoids for about 15 years and have had minimal bleeding throughout the 15 years however nothing like 5 days ago. Additionally my stomach feels weird when I'm digesting food, with a little bit of cramping.

Lastly, there is history of GI issues in my family as my sister and brother both have IBS. My sister was diagnosed with colitis a number of years ago however she was only on medication for a few weeks. I'm a 35 years old man and have no prior history of GI issues. I posted this in the Ulcerative Colitis forum as well.

GI actually thinks it could be an intestinal infection (which sadly is what I'm hoping for at this point). The bleeding they think is a result of the hemorrhoids being very irritated from the constant bowel movements.

Went today for blood work and they are running test for multiple things on stool samples. If everything comes negative from blood work and stool samples I'm scheduled for a colonoscopy next Thursday. GI also said that if everything comes back negative from lab work his first guess would be IBS with bad case of hemorrhoids .

GI did start me on a probiotic called VSL#3, gave me a sample from the doctor's office. Today thankfully I've had no problems digesting food. GI also said my diet should be "not adventurous" for the time being. Did recommend to stay away from dairy until next week.

All the blood work and stool samples came back negative. Going for a colonoscopy on Thursday. I have figured out a way to stop the urgency of needing to after a good BM.....hot bath or heating pad. If I sit in a hot pad for about an hour following the BM that has stopped the urgency to go. Also, the indigestion and stomach aches have increased over the last week.