David - don't give up!
We all (most of us) changed instructors at some point - a lot of us for reasons of chemistry or attitude. The older the student, the more discriminating we are as a customer; some flight schools have not grasped the customer service concept yet!
If you think there is an instructor at your current school that you might be successful with - pursue the "interview with the CFI" route and see what can be hammered out. If not, search for a school with a different attitude.
I found that I preferred to study with older, career instructors rather than hours-building wannabee jet-jocks. The instructor I now use for currency and brushup work is a model of calm and reason - he's not local to me but I deserve the best (and so do you).
You have come so far that it would be a shame to throw it all away when you are so close to the fun starting - once you have your PPL you can begin to pick and choose your flying company and where you go/what you do.
Take EVOs advice and go flying with somebody else for pleasure. I'm sure if you explore the forums there will be somebody in your neck of the woods who will help - we are a pretty friendly lot.