I sympathise. I've had to fire many doctors or other health professionals over the years, including head-of-department hospital specialists. I know in the UK it's particularly hard to get help in the NHS so if you have any ability to go private, even for a GP visit, I encourage you. I've been reading NZ guidelines for diabetes (which are essentially the same in other countries) and I've drawn some red lines for myself based on them.
If my HbA1c is above 65 for more than 3 months, I want insulin, at least until things are back under control. (My GP was slack about this but we are now on top of things).
I want my BP under 130/80 at all times.
I'm pretty sure I developed some neuropathy and loss of beta cell function during the time I was up in the 70s (at least a year). IMO we just can't afford to let these things happen.
Short term insulin therapy can prevent irreversible complications while you get things diagnosed properly and make sustained lifestyle changes such as low carbing. Good info here IMO:
http://www.phlaunt.com/diabetes/15478720.php