does any one get rebound headaches (migraines) as a result of taking chronic pain medications,

for my pain i am taking:
avinza 150mg per day
MSIR 15mg as needed (max 120mg a day)
zoloft 100mg a day
synthroid 50mcg a day

gabitril is one new medication i started (with a starting dose, i think it was 50mg) about 4 weeks ago, but stopped 4 day into it because of constant, but not very strong headaches, incidentally this last attack of migraines continued after stopping the gabitril.

i have been having headaches since then, with some days better and some days real bad, went to emergency room twice, done wide range of scans and checkups with out finding anything wrong with me or my head. I have an appointment scheduled with a neurologist only at the end of this month.