I went flying today and my gimbal wheel speed has reset itself to the fastest movement.  Now I can't even find the wheel adjustment, not in MC settings, at least I can find it.  Help please.

Please help clarify your aircraft model and the mobile device you are using.
You could go to "Gimbal Settings"--"Advanced Settings" to adjust "Gimbal Speed".

I am with you last night it was there and I set it to 100 and adjusted the other 2 settings gimbal pitch EXP and Gimbal Pitch smoothness Can't find the 0-100-setting anywhere which use to be under the transmitter picture  symbol.  Phantom 4