Sorry long winded

Last year, starting about 6 months ago, I had treatment on an old filling, because according to my dentist, the filling would eventually become infected.

After cleaning this filling out, I had to go back numerous of times as the pain I had was unbearable. I had been on a course of 6 antibiotics and several fillings and eventually a root canal treatment done.

It has now been several months and apparently the root canal has chipped, I have always had a bit of a weird sensation after the root treatment, when pressure has been applied around the gum which had the treatment, but no pain when 'tapping' on the filling as apposed to before, when I couldn't eat or apply any pressure on the tooth, which resulted in pain.

Now, the dentist is suggesting I have a crown put over the tooth, now this is where I'm confused.

I have asked my dentist whether I would need another injection like he did several times before (sorry to be a baby about this but I was never afraid of the dentist or needles until this experience happened) I can't go through with anther injection, the more he injected me the more painful each time seemed to get, the injection was positioned right at the back of my mouth, and it was painful the more he had to re-clean the infected tooth out, so I'm now traumatized and never want a goddamn needle near my mouth again, I want to be completely knocked for six before it comes close to me.

I have no idea what to do, I feel like crying and screaming, part of me thinks to just get it extracted but my dentist really isn't keen on the idea, but I have had so much hassle with this tooth, I doubt a crown will solve the problem.

Any advice so much appreciated, I'm also trying to get a second opinion.