Water pressure in shower only (no tub) went way down this morning. Have never had water pressure problems before. Don't think I have a leak all other faucets in same bathroom have great pressure...

Take the shower head off. Look inside; there may be an obstruction from the gasket in the hole.

XenoSapien

I took the head off, even replaced it, the pressure is better but still seems lower than it was.

You may have to "flush" it for a bit. Take the head off again, and turn both hot and cold knobs on. Count to ten, then shut them off. Put the shower head back on (make sure there isn't remnants of the obstruction in the showerhead again). Now try it again.

XenoSapien