I'd like to separate out your questions, and try to answer them one at a time:
Pineal "cyst" is actually not a "growth" but a normal variation--this is formed while your brain is developing before birth, and usually has no health effects. Thyroid cysts, ovarian cysts and ganglion cysts are completely different problems, and unrelated (except that you have them---kind of like a flat tire on a car and peeling paint are unrelated, but can both be on the same car)
High TSH is actually high thyroid stimulating hormone. This is the hormone your pituitary uses to make your thyroid gland produce thyroid hormone. if your TSH is HIGH, it means your thyroid hormone is LOW, so you have to take extra thyroid medication.
Unfortunately 40 years old is often around the age that thyroid problems appear. (along with this being the age when our eyes stop focusing right, and we have to buy reading glasses. )View Thread
its not rebound if you can have 2 weeks with no headaches and don't take any imitrex during that time.
You may want to try Riboflavin (B2) 400 mg/day for headache prevention--there was a good placebo controlled trial (1996) that found it was effective for headache prevention. I have not had any complaints about side effects from Riboflavin.
You could also talk with your doctor about verapamil for headache prevention (usual doses are 240-480 mg/day). It has no cognitive side effects, no weight gain or loss (and generally almost no side effects other than occasional constipation)View Thread
If you have not had a headache (and have not taken sumatriptan) for 2 weeks, its probably not rebound headache.
You don't mention any other medications for headache prevention---if you usually have 2 headaches/week or more, then you may want to be on medications for headache prevention. Most of the medication used for prevention will get along with lamictal (except Depakote, there is a drug interaction between depakote and lamictal).
If you usually less than 2 headaches/week (or you take less than 900 mg of sumatriptan per month) there is no real reason to be on a prevention medication.
If sumatriptan doesn't work very well (meaning you have to take more than 400 mg/week to treat your headaches) you may want to try another "triptan"View Thread
do you snore? you may have sleep apnea, which causes morning headaches.
Its also possible that you still have headaches caused by your neck problem (cervicogenic headache). Your surgeon should be able to refer you to an anesthesia pain physician, who could do nerve blocks in your neck to diagnose cervicogenic headache.View Thread
I don't think there is any way to link the migraines and the acid reflux. The Migraines and the nausea/vomiting could be related (some adults have nausea/vomiting related to migraine with minimal headache).
One of the acid reflux medications (prilosec, Zantac, tagamet, or the generic versions) would help the reflux.
You should really talk with a doctor about the headaches and nausea, and make sure there is no other problem.View Thread