Welcome to the forum KTQ, and you too georgiapeach.
Yea, UC sucks. I'm sorry you are feeling so bad, and so overwhelmed.
But you have to find what works for you.
Ask your doc plenty of questions, although based on his comments about your getting "bigger" clothes, I'm not sure he has the empathy needed?
You should just know that different things and meds work for different people.
The traditional meds, including prednisone failed me, and when my GI gave me a choice of remicade or surgery, I balked at both and had to find my own way. For me that was a combination of certain supplements like probiotics, slippery elm powder, L-glutamine, diet modification, and a little known medication called LDN, low dose naltrexone, which is inexpensive, has virtually no side effects, and most doctors won't prescribe ( but well worthwhile if you go around the system to get it) even though it has a proven track record of putting UC and Crohns patients into remission.
I would urge you to look into every alternative.
There are things IMO that you can control, which will have a direct impact on your disease, the symptoms you experience and their severity.
I was able to control my UC into remission through various supplements, probiotics, diet modification, and LDN , low dose naltrexone.
For more info on the protocol which has put me into remission, please go to this link: https://www.healingwell.com/community/default.aspx?f=38&m=1666318 , and look at the 11th post.
I hope you feel better and let us know how we can help you.