How do I make a bad experience not be a big problem?

If you skim my question history, you'll notice that I have anxiety about medications that might make me feel high, extra-alert, whatever. Today at the dentist I got a few nice big shots of epinephrine as an additional painkiller and they fucked me up--sobbing panic attack for a couple hours, not fun.

http://ift.tt/1wKXmew