Have you put any additives in your gas lately? Sometimes the foil seal on those bottles can get stuck in the fill tube and make filling really hard. Also, there's a vent tube that comes out of the tank and goes up to the filler neck to release pressure on fill up. You might want to check that too. The gauge problem is more perplexing though. I'd say it sounds like a bad sending unit (which is not good news because it's part of the fuel pump assembly and $$$), but you said both problems started at the same time. Hmmm, have to give this one some more thought.