Just wanted to chime in and say I agree with Carole - I think you really should be proud of yourself! I read your first post earlier today, and my immediate and overriding thought was that you'd done really well. Then I checked back in just now and saw your post about feeling ashamed, and I had to say something. The way I see it, you had a difficult experience with the unanciticpated injections and the panic attack, but you dealt with it - seemingly pretty quickly - got through all the remaing work and came out victorious! As I see it, that's an achievement - you deserve a big well done!
I also get panic attacks, and they are not to be made light of. You often can't stop them coming, it can be a horrible experience, and it's far easier to give in than to fight it and regain calm. But you did just that! I know how hard that is. And I would think your dentist (especially if he's as nice as he sounds) won't think at all badly of you over what happened - to start with, it sounds to me like you didn't really require any extra work, just a bit of extra time. What's a couple of minutes in the grand scheme of things? Non-phobic patients may well need a break longer than that long smetimes (albeit they may not require it quite so suddenly! ) He was probably concerned about you when it happened, relieved when you were ok, and proud of you for getting through it. His aim in the appointment was to do the RCT, and you let him do it (injections and all) - objective achieved!
As for the way you're feeling now, I've learned that's all part of the phobia. I actually feel a bit hypocritical writing all of this, because I'm usually the one feeling embarrassed and guilty and stupid about the way I've acted during my appointments, and fretting that my dentist is now annoyed with me and/or thinks I'm an idiot! (Don't feel obliged to, but if you look at any of my past posts, you can see it's a clear recurring theme!) If nothing else, I can say that you're definitely not alone either in what you did, or in how you feel about it now. It's also always easier to see things objectively in someone else's situation! So, just in case it helps at all, it's my 'expert' opinion that your actions today are, in fact, something to be proud of. Just saying!