Dental Woes

We all love the dentist don't we? Actually, I really do like my dentist and I recommend everyone I know to him. I recently went in for my cleaning/check up and we have been keeping an eye on a crown that I had for a root canal awhile ago. Nothing was that wrong with it but the dentist wasn't satisfied with the way it looked so he suggested making a new crown, just to be safe. So we made the appointment and he took off my old crown, sent off for a new one and made a temporary in the mean time. Well like two days later the temporary fell out, more like broke and so I had to go in for a new one. I was just pleased I didn't choke on it in my sleep. So the next one they tried a new cement concoction to try to make it stay better, and it did. This was lasted about four days and again the dang thing fell out. So in I went again for another temporary since the new crown was still on order. This time they tried a different type of tooth to see if that would stick better. I thought for sure that this would do the trick.... but just 3 days later I was eating dinner and afterwards I was like uh oh, I think I swallowed my temporary!!!! So am I going to die of metal poisoning because the new tooth they tried was a metal one?... I keep thinking, do I feel funny?? Is it scraping my insides? Well I guess I am not dead yet so I think I am OK. But right now I am on my fourth temporary tooth, and he tried all the tricks he knew to try to keep it in, so keep your fingers crossed for me. I think I may have toxic saliva that eats away at the temporary holds. I just hope this one doesn't fall off because as much as I enjoy spending my time at the dentist I have had my fill, no pun intended. The dentist said he has never had this much trouble with anyone before. My question is, has anyone had this happen to them. I am not blaming the dentist at all, I really do think it is me, its just weird.