I am not sure who Mark is, but I have some questions for you.
Bromcriptine is a treatment for a prolactinoma.
Synthroid is for your thyroid.
Perhaps you need more testing as when you have a pituitary and a thyroid issue, often you have more endocrine issues - and you need constant testing and tweaks in medications. Also, it seems that those with pituitary tumors also need a bit of T3 to feel better as they do not convert the T4 to T3 well.
Are you being followed by a neuro-endo?
Do you also have your most recent thyroid labs you could post here for everyone to see? Much easier to comment if we can see some history and labs. :)