Would it be able to get a prescription?

I've read through the requirements an am not quite sure exactly I would fall on some of them, so was hoping someone might be able to offer insight.

So ADHD and ASD diagnosed about 5 years ago. Relatively functioning on paper. I've tried 2 medications for ADHD. One did not work. The second worked a bit but made sleep tricky (trickier). I did want to stick with the second one, but fell off the titration and am on the wait list to get back on. I've also briefly tried CBT twice, but both times stopped after the first session as I really couldn't get my head around it (this was through work though and I don't have anything to evidence this). I have previously used cannabis illegally, mostly for recreation, but I did love the sleep on it also.

Obviously no issues with having a condition to treat, but don't know if I have tried alternative treatments enough to qualify for a prescription? Anyone know?