MissMarple,
Welcome to the forum.
You've been given some great ideas here, from great people.
It's good the meds are working for you; they failed me.
I agree with Max, supplements and diet modification can help you to the finish line.
Slippery elm powder, probiotics (which ones are you taking btw?), L-glutamine amino acid powder as well.
I used to be a foodie, so I understand your reluctance to go gluten free, it's tough.
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.