2001 Ford Ranger oil gauge flickering and engine knocking

I was going out last night and noticed my oil gauge flickering and when I was able to pull over at a exit ramp my truck was making a knocking noise I think I screwed my engine cause I think there was to much oil in it by how much oil im not sure I tried to get it home but the truck stalled out I heard if the engine has too much oil it froths up and the pump can get the oil where its needed I want to know if my truck stalled out and was knocking have I done major damage to it or did I catch it in time before the damage was done