Still sick

I have been Gluten free for 10 months now. I am still suffering. I had an endoscopy and the blood test, I am VERY careful about contamination. I mostly experience the GI upset, (gas bloating chronic diarhhea). Headaches and overall fuzzy state of mind have continued but are not as severe. My intestinal issues are very painful, sometimes affecting my work or plans. I avoid dairy, as I know it can be related. I am truly at a loss. I am wondering if it is possible I was misdiagnosed! Anybody have any words of advice or is experiencing the same thing please reach out to me.