Get check for celiac disease. It can cause severe multi symptom issues, can cause acid issues, can cause heart issues, can cause extreme anxiety and mood issues, thyroid issues, etc. so many doctors do not know all the neurological issues it can cause. It can be very debilitating and can actually be fatal in extreme cases. Also, if you are not being tested and investigated by specialists get referred to a variety of them until you get some answers as a gp doesn’t not have the experience or expertise to deal with severe rare illnesses. I hope you get some answers.