You might want to switch from lomitil to Imodium. Sometimes one works better than the other. Are you taking Metamucil? It will provide bulk, if you opt for the powder follow the directions on the container but only use about 1/4-1/2 cup of water. Many people like the wafers better but you could experiment.
It took about 6 mos for me to eat fresh fruits and vegetables without them speeding through my system. It takes time for the body to slow down. Some foods work better than others, peanut butter made me worse as did applesauce, however others have had great results with them. Keep a food log. Try new foods, if they don't work, try them again in 2-3 weeks. Log results. Eventually you should be able to have a full and varied diet. I live on fresh fruits and vegetables now but it took a while to achieve this. As for weight loss you can try bulking up by using powders or drinking high calorie shake drinks. They make them dairy-free so you should be able to tolerate them.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free