Help fix my teeth problems!

My name is Cindy and I'm having serious trouble getting my teeth taken care of. Currently I have a fractured molar that also lost the filling. I now have a large hole in the middle of the tooth where food can settle in. I can't chew on that side but food still gets in. I now have an abscess from food getting germy and causing the infection

I am 66 yrs old on social security. I am below the poverty line. I have Medicare. It doesn't cover teeth. My advantage plan has a few dental dollars that got used up on other concerns. They cap at 500.00 a year. My dentist said the tooth is not repairable and needs to be extracted. Because my 500 is used I have no insurance to get it pulled. I need to pay for that myself. After its removed I have no molars on the bottom on that side. I would like to get an implant so i can chew on that side.

On the other side I have another problem. The last molar needs to be crowned and I have a gap between my molars there. I hope I can get that fixed before I end up with a broken tooth and infection on that side.