Does anybody take biologics w/o definite diagnosis of Crohn's?

Saw the orthopedist based on my GI's recommendations. Last year, we discovered that my right foot started to be bend inwards. The solution then was wearing walking shoes and inserting flat foot insoles in them. Things became worse lately. My foot started to be bent inwards and outwards. I was at the supermarket and some money fell, I bent to pick it up and I was about to fall.
After the examination, the orthopedist told me that my right foot has become very weak; the muscles are very weak. The left foot is also weak but not as weak as the right foot. My left knee has been affected too. When I asked him whether entocort was a culprit, he said yes it weakens muscles but he denied the fact that he could ask me to stop it.
He advised me not to stand for a long time, not to drive and to take calcium and vitamin d supplements. For the knee, he prescribed a medicine that builds up cartridges but said we have to take my GI's permission first.
I'm now very worried that this prolonged use of entocort and steroids is affecting my muscles severely. I know many of you did and will tell me to take biologics but I don't have clear cut diagnosed Crohn's. One of the features of Cohn's are missing from my biopsies; actually a number. Symptom-wise I fit perfectly well into the category of Crohn's. I respond to entocort, rifaximin and Imuran. I have rectal disease that is typical of Crohn's but my biopsies lack something. My GI told me several times that I'm not illegible for biologics yet.
So, I'm just wondering whether any of you, who do not have a definite Crohn's diagnosis, but is on biologics. I need to fight with my GI to try to save my feet. I'll try to take an appointment soon.

Myrne, thank you so much. Yes, I'm not a US resident. My GI is just following the rules that necessitate having a very active severe case of Crohn's to prescribe biologics other than that the patient has to cope with the milder forms. I doubt if I go off steroids and take biologics, I will respond well. I'm a steroid -dependent patient. I failed methotrexate, pentasa alone can't do anything and the same applies to Imuran. The only good thing Imuran does is lowering WBCs but I cannot live on it w/o taking entocort. I remember that when I was on 40 and 30 mgs of pred, I did have d and severe cramps not found now w Entocort. My sole concern now is my muscles. They are deteriorating and I don't want to find myself all of a sudden with a disability.

Jen, thank you. Well, actually, my current GI is the only one who is convinced I have Crohn's. I sought before several second opinions but they all suggested IBS which is not the only thing I suffer from. My current GI told me I have both IBS and IBD. The problem is not him it's the stupid rules that necessitate meeting all the criteria to be granted biologics.

NCOT, thank you. I know that you advised me several times before that I should stay off entocort but it's the only thing that made me have somehow a "good quality of life". Eight years ago, I was literally dying and pain was a 10 24/7. The strongest painkillers like tramadol and even stronger couldn't control my pain. I've always had been diagnosed as having IBS but I started then to develop other symptoms. I used to get a fever that with an onset of 37.5 C and immediately after 2 hrs it would jump to 39.5 C. That was recurrent; if I might not be exaggerating that happened every month. I've always suffered from severe constipation but since 2007, I started to have d 7+ times and sometimes they were like 20 times and I had to be sent to hospital then. I lost weight drastically then.
I have chronic proctitis based on pathology and non-healing anal fissures for many years. Two years ago, I got a perianal abcess and after a lot of antibiotics and injections it was cleared.
I have non-responsive anemia to iron sucrose (Venofer) iv injections. I have malabsorption of all vitamins and mostly vitamin B 12 and need to take a monthly B12 injection life-long.
I'm not advocating my GI and his plans w me. I'm really at a loss and have a lot of other symptoms that I don't want to bother you with. At the beginning I was told I have mild infectious ileocolitis. For months, I have been put on antibiotics but w/o any avail. Then, I had another colonoscopy and was put on pentasa. Again, it was alone ineffective. It was only when I was put on pred that things started to become better. However, when I began taking entocort, I discovered that life has become better.
Would you still consider this still to be IBS?
When I google "ileocolitis ", it says the most common form of Crohn's. However, both my GP and my GI's assistant tell me it's not Crohn's.
Last year's colonoscopy showed mild ileitis which was confirmed by pathology.
I don't know whether it's just because my condition is mild they tell me this or whether it's because I'm on a lot of meds that it should be mild.
I'm really perplexed.

Thank you NCOT and hope you are better now. I'll leave things to go on as they are destined to be. I don't have the energy nor the time to seek any second opinion at the time being.