Dave,
Speaking as an instructor, for god's sake don't chuck it in now. We all have bad days (FI's included!) Try not to worry too much about someone giving you a hard time just before your test. Sometimes it's a technique we use to make sure people don't get complacent. If he's like it all the time, bin him and get another, there are plenty about at the moment!!
An instructors job is to turn Bloggs into a safe and competent pilot, Sometimes it means getting a bit nasty. This is especially true with students who turn up repeatedly without having done any pre-reading or thinking. (I'm not for a moment suggesting that's you though.) Often you are working harder than the person who's paying!!
I can promise you that if you don't continue, in time it will become an annoyance. I have had numerous students who have done this, only to return a few years later and have to start over again.
Flying IS supposed to fun and generally it is, but sometimes it will scare the cr*p out of you. Does this mean you never do it again? I would have stopped after my first teaching trip if that was the case!
Take a couple of days off, relax and maybe if you fancy, hire another instructor and just go for a jolly.
Which area are you currently flying from? Don't get too specific.
If you want an FI to chat to about it, just PM me. Believe me in that unfortunately this happens far too often.
