Thanks for your advice. I've gone ahead and booked another appointment with my doctor, and I'm going to ask him to do a full blood test.
Hopefully I can get to the bottom of it!
Whether or not you have Celiac's, is impossible to say. But I can say, that many times when we experience changes to how our body functions, it has to do with our vitamins. You should start by getting full bloodwork done, especially B12, Vitamin D, folate and others.( I had a vitamin deficiency - B12 and vitamin D, that suddenly made me react to milk and eggs) That will give an idea of what's going on. And please don't just take your Doctors word, that they all look in range.
The problem with Doctors is, that they don't react to a low level, you are just either out of range, or in range. And that is - of course - not how our body functions - it is not just a switch, that gets turned on and of. There's a difference to quantity and quality!
So if you do take my advice, and go ad get your levels tested, make sure to get a printout, so that you can see the levels yourself.
Best of luck!!