Is it normal to have a throbbing pain, day and night, under a temp crown? Will I need a root canal all of the sudden?

I had a crown replaced on one of my top molars. Within a week, my temp came off. They replaced it and it fell off. I went back for the perm, he didnt like how it fit. He sent it back & put on 3rd temp. Week later, third temp fell off, but the perm one was back in. When I went in, he didnt like the color & sent it back. Put on ANOTHER temp, fell off. When perm came in, he didnt like it anymore. Took impressions and he drilled away at my tooth, and now I am on my 5th temp & now it's throbbing.