Hi
My name is Deb, and I'm bipolar (rapid cycling, mixed state) and I have thyroid problems.
I have Grave's disease which causes hyperthyroid, I was treated with RAI and am now hypothyropid, I take 175 mcg
Levothroid daily.
My psychiatrist put me on a psychotropic cocktail consisting of welbutrin, topamax, zoloft, and buspar. Between her and my other doctor, I'm monitored closely and there's been no need to have any of my meds adjusted in 3 years.
Just like everybody else, healthy or otherwise, I have good stretches and not so good stretches. To think I'm ever going to feel completely well is a bit, delusional.

As for tanning, stay away from it, meds or not your skin will thank you. When your 45 and still look 35 you'll be happy. But I digress.
Thyroid affects bipolar, meds can mess with your thyroid, thyroid affects bipolar. The meds I take have not affected my thyroid.