I think mistakes were made with my bridge; now it broke and more mistakes were made with the repair?

Hello, I recently had a bridge break and the dentist elected to repair it instead of replace it. I have two major concerns... The first involves the bridge breaking. One of the end teeth on the bridge chipped off at the top edge after my latest cleaning. I'm a nervous dental patient and expressed concerns about anything like that ever happening at a cleaning and was assured beforehand that porcelain was super strong and it wouldn't break from the instruments (and then it did). When I came back in to get this looked at, I told the dentist immediately the injury to the bridge happened at the cleaning (in his office). The dentist asked how old the bridge was, and I said not even a year old! He kind of shrugged that off, but shouldn't this be cause for alarm? I've never heard of anyone's bridge breaking that fast. He said it could have been defective from firing, but that didn't stop him from charging me for the repair, of course. I want to add here that I've observed impeccable oral hygiene. The last thing I wanted was to have to go through more of this kind of work. I've done every single thing I've been told to do to care for my mouth and this bridge. My second concern is that he did a high filling in the edge of this bridge to repair it. Beyond what I've read about it being a VERY temporary fix, I have found in the couple days since that I can't floss between the end of the bridge and my natural tooth. Is this something he might have done on purpose to make the repair stronger or is it a mistake that I can't floss here? I've been using the threader up at the gum line in this area now too, but things are only sealed in that crease at the front of the natural tooth, not behind it. I worry if food gets in there I could get a cavity. What should I do about all this? He said he didn't want to redo the bridge because he was worried about causing "more damage", and to be honest, I don't want to do that either because I'm betting he's going to charge me thousands more for it, which i can't afford after already spending thousands..and I'm pretty sure my dental insurance won't cover any portion of the redo. Do I need him to look again at the filing he did? I'm getting really scared. Nothing about this situation seems normal, particularly how quickly I'm having problems with the bridge. Please help!