My point is that we live in side effect land after transplant. Don't freak out about more diseases unless you have to. Hopefully you're ok.
If you read the patient information sheets that come with all of the meds you are taking, all of the symptoms you are having can be a side affect from at least one, if not more than one, of the drugs you are taking.
When I had major surgery 4 years ago, at five months post-surgery, my hair started to fall out, too. I asked my hairdresser about it, and she said that she sees that all of the time in her clients who have had big ops. It's a delayed reaction to the trauma of surgery. So, I'm halfway expecting my hair to start falling out in about 4 months' time. LOL! Good news is that the great fallout stopped after a couple of weeks. It occurs to me that pregnancy can be a big shock to the body, too, in someone who is sensitive to such things. So, I'd be willing to bet that your problem isn't your thyroid, but it is certainly worth asking about.
Let us know what you find out. I'm going to go find my broom...