You're in great company if you're an ADHD Introvert :)
I can see by what you've written, that you have some insights into both areas.
Here's the thing. Success really is an inside job first.
I've watched many people get the things in life they "want" only to still be depressed and unhappy.
Before changing careers, do some inner work. Maybe start with gaining a greater understanding of ADHD (and the plus's we have because of ADHD) and being an introvert PBS had two series I recommend. ADHD and Loving it and Dr. Amen's ADHD program.
There are some excellent books on celebrating being an Introvert. Susan Cain is GREAT! I have her TED talk on my blog www.MarketingWithIntegrity.com just do a search for introvert.
NOTE: the fact that you're a good listener is a good thing IF you want to go into your own business. However, from what I read, it sounds like you'd be better off, right now, being part of a team... for company that appreciates you.
Getting back to your question... Would I recommend a career change?
If you're not happy I would start with inner work first before you find your ideal career and "go for the brass ring".
Because if you were to change careers now, you'll be adding stress to your life. Good stress is still stress.
