The treatment of ulcerative colitis is highly specialised and you should be under the care of an expert, a gastroenterologist and not a remote panel of doctors since the treatment is very individualised.
Steroids should only be used to control an acute relapse and should not be used as a long-term basis. The best long-term medication is sulphasalazine or mesalamine in proper doses. If these are not effective in preventing relapse, you may need immunosuppressive therapy like Azathioprine. However, this has to be determined on an individual basis. I suggest that you contact a specialist as soon as possible.