I let my tank go empty by accident and when I went to fill up, the gas meter barley moved and now it hardly moves at all to the point I don't know how much gas I have. Can be fixed?
You will probably need a new fuel pump/float assembly. I would drive it for a while to see if it clears up. Fill it up whenever you get a chance and use the trip meter to know how far you have gone on the current fill up.