Is it gluten?

[smashysworld]

I have been ill for over two years. My mum when she was alive had celiac, she used to be sick physically if she ate gluten. she was diagnosed later in life. 
I started to have issues two and a half years ago , it started with a small patch of dry skin on my arm, and progressed from there. I started to have major skin issues, rashes, itching, headaches, sinus issues, sleeplessness, the list went on. I went to allergists, immunologists, rheumatologist, oncologists etc etc. I had extensive allergy tests, blood tests, nothing came back other than inflammation which was sky high, I started getting gout, joint pains the whole lot. My life has been hell for all this time. I have been on and off steroids for months and months, the symptoms disappear when on them and come back when I come off them. I have tested twice negative for celiac but my allergy tests for food came back with reactions to barley and rye.

two weeks ago whilst on the steroids I started to notice that if I didn’t eat gluten my skin felt marginally better. I reacted to a couple things that had wheat in them.  I am thinking that whilst I don’t maybe have celiac I could have the non celiac gluten intolerance. 
For the last week I have been strictly zero gluten, even down to changing my deodorant because it had gluten in it and my arm

pits were extremely itchy. 
I guess my real question is how long after I give up gluten do you think it will be before my skin calms down and I might be able to get off these steroids? 
mist been an emotional rollercoaster the last two years, I hope I may have found the cause now but I am not sure. 
also I don’t eat dairy anymore as I seem to have also developed an issue with that, I believe the two sometimes go hand in hand. 
many helpful advice will be appreciated. I just want to feel well again 😔😞😔😞