A distant cousin developed severe alcoholism in her 20s, with depression, anxiety and weight gain. It took several visits to A&E, the GP and three dry out clinics before a private dr checked her thyroid. Yes, hypothyroid.
What a waste of her life, what a waste of NHS money!
I read long ago a site by a old dr who said every one of his hypo patients was alcoholic when they presented. I know that doesn't apply to all, but I think it may well be common. And the other symptoms were staring them in the face.