If you're still feeling like this now - Go to your doctor. NOW (ASAP)!!

If not that (which I HIGHLY recommend) , tapering off is a good way to do it. Take half the dosage you'd been prescribed. You can always cut pills in half. Do that for a week or two, then keep "halving" it until you're taking a minimal amount. Withdrawal shouldn't be that bad then.

Go to your doctor. See about getting another AD to replace it. That will help with the withdrawal effects as well, because your body will love the fact it has the chemicals back in it.