Zab - you say you are having convulsions as you drop off to sleep. Are you sure these are convulsions? They sound more like what I call "falling to sleep jerks" - it happens when one is just about to fall asleep and it feels like you are falling and so you jerk yourself awake.
I'd say if you are truly having convulsions this far into your sobriety, you might want to see a doctor and have that checked out.
Congrats on your sober time.
CF