You sound so similar to be with the past medications and side effects. I seem to cop everything from most meds!

I've had Amitriptyline in the past but only briefly, it did wonders for my sleep but ended up making me lose my short term memory and become very agitated the next day. Which is what Seroquel seems to do to me too. I didn't give it all that long though, so if it's working for you now maybe just keep it up?