Worse D + left side pain + GI abroad

Three weeks ago, I had severe mushy D, saw GI then. He prescribed 2antibacterials and Rifaximin. This resulted in constipation for 4 days. Then, D followed with bleeding. anal fissures. Pain became worse and I became bloated while having D. So, I saw my GI who insisted that I continue Rifaximin and take lacteol fort ( probiotic) and taper Entocort. Things became better and bms went down to 4. Now, I have left side pain which I have never had before; I've always complained of right side pain, mushy explosive urgent D, and erythema nodosum started to appear on the shins of my legs. To top it all, my GI is travelling. What should I do stop the Rifaximin ( I take it twice per day only), increase the probiotic as Imodium started to cause me pain? I decided to take Pentasa to relieve the abdominal pain I get after every bm but it does not control left side pain. Any ideas?
Your replies are highly appreciated.

Someone should be covering your GI's patients while he is away. Call the office and listen for that info. None of us would dare second guess what your doctor might want to do.