Please help me figure out what this is.

I have been dealing with some crazy health issues for a long, long time.  I think we are getting some where with teh diagnosis now but I could really use help from anyone who knows what this might be.

my symptoms have been diarrhea, constipation, headaches, severe unexplained weight loss, low grade fever, mouth ulcers, headaches, dehydration, fatigue, weakness, stomach pain, inflammation, dizziness, nausea, vomitting, vertigo,and more.  Those are the main symptoms though.

I have been diagnosed with malabsorption do to high amounts of fat (stearrohea(sp?) in a stool test.
My fasting gastrin level is 234.  I would like to mention though that I was on a low dose of Nexium when this blood test was done.  I have erosive gastritis and both regular and bleeding stomach ulcers that were found during an endoscopy.  I have also been told I likely have "dump syndrome".  My b12 levels were low but were not out of range.  My gastro told me that for a 22 women my b12 level should be 600-800. My is in the low 200's.  I have had blood in my urine, a low serum IGA level.

My doctor has scheduled a secretin stimulation test for me.  If any has Zollinger- Ellison you help me decide I fit the disease? And if anyone has anyother ideas please share.  This is ruining my life and I am barely surviving right now. I just want to know what is wrong with me.
Thank you.

[Redsnapper]

I forgot to mention that in all of the blood work that has been done over the past 2 years my lymphocytes have been elevated. I don't know if that is relevant or not.