I have UC also and I've found castor oil packing helpful in the relief of the pain. It's a bit messy, but once the pack is on you can sit or lie back and relax.
Basically you'll need to get some cold pressed castor oil, a 100% woolen/cotton cloth. Soak the cloth in the oil, massage some directly onto your abdomen, place the cloth to cover effected area, wrap some cling film around to hold the pack, then place a hot water bottle over. Wear some old clothes for obvious reasons. Leave for a least an hour. Try this hope it helps. Flaxtea/ Oil Enema s/ implants will probably help as well.
If you use an enema then try up to one pint of the tea. If using an implant the 2 oz the neat oil should suffice. Experiment. Good luck