Why will my doc not test me for Celiac disease when I have depression and all the other symptoms?

I would like anyone's opinion on how I should proceed here. I had never heard of Celiac Disease until about a week ago... I have been having Symptoms that relate to Celiac since I was a small child. Let me begin there... As a child I had seizures. They went away at around 2. I have always had very bad stomach problems. Nausea, weird abdominal pain, vomiting, and cramps with bloating sometimes. As a child I also had anxiety problems and mood swings. The doctors always said I had a nervous stomach. Of and on I would have other strange things pop up and go away. When I was in college I lived in a house that was mold infected and afterwards My problems worsened. I began having seizures again (temporal lobe). I was having panic attacks, sleep problems, diagnosed with severe depression, and all of a sudden they said I had ADD. Now I am 40 and for the past 10 years I have still been having all of the above problems plus I have had Kidney Stones, they now say I have Hypothyroidism, High Blood Pressure, Osteo-arthritis, really bad joint pain, muscle cramps, tingling in my extremities, bad fatigue, sleep problems, seizures that they can never seem to find a reason for, edema, I have become lactose intolerant, and I was diagnosed with foliculitis but, I also have a rash on my hands and legs and buttocks that is not consistent with foliculitis (it is more like blisters under a layer of skin but they don't pop or anything). Can anyone tell me if They think this is Celiac's? Oh, I am also Insulin resistant and I asked my Endocrinologist to test me for Celiac and he told me no???? What is that all about? One last thing.... I have also tested off and on as being anemic and also I had to be hospitalized once because my potassium level was extremely low. Should I go to another doctor and get tested? Is the blood test real expensive or something? Not sure how to proceed but I am honestly at my ropes end with this.... No doctors seem to want to help me figure out what is causing all this.... Thank for any help you can give me.....