Psychotropic medication:?

I was prescribed the anti-psychotic and sedative quetiapine for mania. It works interestingly in that in lower doses it works as a dopamine, serotonin, and adrenergic antagonist while at slightly higher doses inhibits histamine receptors causing a rather dysphoric state familiar with the anticholinergic state.

This drug did wonders on my mania however ever since discontinuation I have been unable to fall asleep on my own without much difficulty.