Chris00deuce

Help
I adopted for 1 1/2 years ago a 4 year old red/ black male German Shepard name Ranger .He was on pedigree food and I didn't change him but after 2 month his stool changed to soft smelly and yellow with blood and mucus .After blood test, parasite Test ,antibiotics ,Budesonide ,home cooking still having very bad days like yesterday.He loose total control over his body, watery bloody diarrhea all over the place. And looks like he is in pain he lost 28 pounds in 6 month I finally got 7 pound back on him.He is a very mellow and obedience dog .Please help me I am on the end of my .........