What's causing my digestive problems?

I started out having chest pain and was cleared of 3 separate ekg’s. Then I was getting sparatic itching all over but it felt like it was under my skin (like in my veins). I have had loose stools and a CONSTANT rumbling in my stomach like hunger growls that keep me awake all through out the night. I also eat and feel like there is a lump in my throat plus it radiates up the neck a little ways. Get sinus type of problems associated with all this (itchy eyes, dull headache around eyes, and sinuses pop like they are dilating). GI doc thought it was lactose intolerance but went off dairy for 2 weeks with no change. Had an ultrasound, stool sample, numerous blood tests, upper gi endoscopy with 3 biopsies which all came back negative. Often afraid to eat cause not sure of the effects it will have on my digestive system,. Have lost SOOOOO much sleep cause of the stomach growls. Taste juice in my throat sometimes (not very often) but I have been taking both Omperzole (4 Years) and Pantoprazole (1 Month) with no avail (really don’t think it’s acid reflux.) I have slept in my recliner for almost 2 months because the growling in my stomach seems less when I am inclined. Very bloated, burp and pass gas a lot and get sparatic muscle type spasms in my intestinal area and sometimes in my arms and legs. Gonna request a colonoscopy next. After that, not sure what to do.

Any answers or thoughts, please let me know. Thanks.