Photoshop :: Most Of Layers Have Their Colors Inverted?

I think I might have accidentally used a wrong key command but as I was working on my digital art peice; the yellow from the layer I was working on turned green. So I thought to myself I must have accidentally pressed the key command for inverting the colors on the layer. But when I tried to invert it again, hoping it would turn to yellow again, it actually turned purple. So I zoomed in but then all of the other layers changed colors too. Some of the layers retained their original color but are still distorted and inverted.

I tried closing photoshop and reopening the document but to no avail. I also tried resetting all of the settings but that didn't do anything either. I think I'm going to have a heart attack if I can't fix this problem; I spent months on this and I have about a thousand layers ...