Thyroid; hypo?

Did he also test your TSH? Was that normal?

If all your thyroid hormone levels are normal, that probably isn't causing your problem. Even if you have sub-clinical hypothyroidism (low for you, but "normal" for the blood tests), I don't see how that could cause such extreme problems. What did the doctor tell you that the abnormally high anti-thyroid antibodies meant? Did he tell you to get regular follow-up blood tests to see if you do become hypothyroid?

You could always get a second opinion by taking your lab results to a different doctor, but you might just want to get a full physical to check for other problems. You could have some other hormone issue or something else that is causing your problems.

You mentioned auto-immune diseases. Is that just the thyroid or are there other things? Could that be related to your problems? Are you on any medications that could be causing any of your problems?

There is also the possibility that you are depressed and need to be treated for that. Depression can lead to weight gain and other things can cause dry skin, such as poor diet and not drinking enough water. I do think you need to rule out other issues before you are just labeled as "depressed" because that can be really hard for a doctor to look past and find other problems that may actually be there.