Thank you people for your suggestions. I actually forgot that I had some melatonin up in the cupboard. Took a couple of those and 100mg of seroquel and managed to fall asleep for an extra hour (better than nothing).

I should have mentioned that I take 800mg of gabapentin before bed. Actually, fudge, this is what I take before bed:

Gabapentin 800mg
Lamictal 100mg
Loxapine 25mg
Propranolol 20mg
Seroquel 200mg
Topamax 100mg

I've been on ambien in the past, but it didn't help me sleep, just made me hallucinate. I may not have been on high enough of a dose though.