"ADHD shared care chaos"

After suffering with mental health problems since the age of 4, I was led to believe I may have had undiagnosed ADHD. I approached my GP with my thoughts and after him telling me it could be years on an NHS waiting list, but if I could afford to go private and take the burden off the NHS, he'd agree to shared care, I paid for a private diagnosis with Clinical Partners.

After receiving the diagnosis and paying for a number of private tests (heart, blood etc) I was put on Lisdexamfetamine. I continued to pay for treatment for a year while they made sure the medication was stabilised in me, at which point my GP took over care.  That was a year ago, and things were going great - my life was so much better - I grieved what I could've been had I been diagnosed earlier.

Unfortunately we had to move house and with that switch GPs. My new GP immediately stated they refused to prescribe Lisdexamfetamine and I would need to go on the NHS assessment wait list again. Meanwhile I've run out of medication (quite a few months ago now) and my house of cards is starting to collapse. 

 I'm worried if I try to switch GPs again I'll just be viewed as drug seeking (in the bad way, not the legitimate way) and wouldn't know how to find someone who will prescribe it at this point anyway since it wasn't really shared care any longer - my GP had taken over everything.  Do I go back to the private practice? Will that kick me off the NHS wait list? I can't afford to pay for it forever, and I don't even know what the process would be if I did go back to Clinical Partners. 

I also won't make it the years I've heard the NHS may take. I'm frustrated and scared