If all your teeth needed was a good cleaning, then you would not have had any pain, nor would you have any now. You need to go to a different dentist and ask for a thorough evaluation; if you think your teeth fit "loosely" that could be a sign of oncoming gum disease with the possibility of losing your teeth.

Did this dentist take dental x-rays? If so, get them from her and take them to the second dentist you see.

Tip: i've been to the dentist every six months like clockwork since I was a small child. I've been with the same dentist since I was 12-13 (i'm 47 now). The single thing that has made the most difference in how my teeth feel and how they look at a dental visit has been the sonicare electric toothbrush. I know they're expensive, but if you care about your teeth, it's worth the money and more.