Talk to Dermatologist on Skin Allergy

5 years ago, one morning i was diagnosed of Chronic idiopathic urticaria, i am hypothyroid and pcos patient as well. For allergy my allergist did thyroid antibody test which was raised and other blood tests were normal, i was upon many medicines only Atarax and tday worked fr me (levocetirizine). I was told its autoimmune may be due to thyroid, source unknown and there is no cure until it ends itself. So i stopped visiting drs n only have been tsking tday syrup 1 tsp fr past 5 years. My skin is very dry, hair falling, eyes so dry ive to use drops every two three days. I read if i somehow find out the cause if it then it can be controlled. So drs plz advice what to do next? Also i want to mention here, the first time i got this allergy, that month i was working very closely with oil paints (painting room for two weeks) and entire time the door was closed so no ventilation. I did tjis for 2 or 3 weeks and then i developed this allergy, so can there be any connection?