This may be too late but...

I had this problem with my 1999 Camry and it turned out to be a bad starter motor. At first tapping on it would allow me to start the car but after a while it'd take more and more until at one point it just stopped starting period.

If this turns out to be your problem it's a pretty cheap and simple fix to do yourself for the most part: pick up a starter at O'Reillys , pop the old one out and the new one in. It was pretty straightforward so I didn't use a guide or video but this video seems to be a good start.