Hi ladies, my thyroid packed up years ago, doctor reckons pregnancy can be one of the causes, I had twins so I'm grateful that was the only thing that packed up. I put the weight gain down to post pregnacy tummy. 12 years on it's still there. It's a pain but there are many illnesses that are worse. Mood swings I put down to menopause, teenage children and the stress of everyday life.
Keep pestering your doctor to send you to a specialist.
Cheers
Fiona