Pam I am so sorry that you had this happen. They blam a lot on dry mouth from meds. My daughter had a lot of issues like that. I did have two molars break off about 2/3 3/4 of two of them. From foreign particles in food from our Local Muckey D's. The hamburg had a bone I hit and the tooth had a old filling, the salad had a hard, like a stone in it, tooth with old filler...But I did not lose them, or have pain. The dentist did build them up with a lot of filler material. Knowck on wood several years later thay are still great and none of the problems my kids had when they had root canal and crowns put on. I have shinney back teeth, but who sees them.
When I went the xray was around $15 and filler 50 If I remember.
Try a local college or dental school program. THis weekend a mobile dental van visited and did as need what they could for free to folks. IF you have a HELP line or emergency info line in your county call and ask.
Try to save what is left if you can. Oh, I did not have the rest of theold filling taken out, they reformed using that tooth and filler as a base to shape a new tooth.
Hugs
di