If you are self harming, you should call your doctor asap. If I misunderstood that, perhaps a bit more time may determine better what's going on.

Most ADs have affected me within days, or a few weeks at the latest. As for other meds, I have learned to give them at least a week before passing absolute judgement, unless bona fide danger cropped up. There can be the mental "paranoia effect". IOWs, the brain playing tricks because of anxiety, expectation, or other comparatively benign causes.