I am on Provigil 200mg twice daily. I take one in the morning then one more at 1pm that way I can make it through a day of work. I also as on Synthroid for hypothyroidism.
I was on Provigil for quite a while due to sleep apena.
Have you had your thyroid checked recently? What strength of thyroid medication are you talking?
Provigil had a similar effect on me. I would get a hyper feeling for a while and then just crash. Adderall has a similar problem for me but you can take it every four hours and control when the drop off will happen.
That's exactly how I am. I even drink a pot of coffee with my provigil and synthroid. It's still lights out after 5 hours. A 3 - 4 hour nap for me!
Not good.