"Getting support"

I am an adult female in my thirties. I have a long term history of depression and anxiety. Following another serious relapse I am now on the mend however I still feel like there is something ongoing with me. Having unfortunately years of experience with poor mental health, I know how the symptoms and medications work. I feel I am better, but there is something still wrong.

Following my own research, I believe that I may be experiencing ADHD. I spoke to my doctor at Cornhill about this, however, frustratingly they only asked me about my childhood. While I am no expert, women are usually not stereotypical in their symptoms in comparison to men and are often misdiagnosed. I spoke to my psychologist who sadly said the same thing. Following a call with my GP, they sent me a questionnaire to fill, which shows that I am indeed a candidate for at least getting further assessment. When I followed up with my GP (a different doctor to the one who sent the assessment) to see where I stand with my assessment, and the progress with it, all they could say that it is up to Cornhill. I have had no further appointments with Cornhill scheduled. 

I am feeling incredibly disheartened. I am left with a piece of paper that clearly shows I need to be seen, but nobody seems to want to take me on board with this. I am left in limbo until I am seen again either by Cornhill, or I chose to keep pestering GPs, who don't seem to want to listen to me.

I recognize that a diagnosis is not guaranteed, and it is a long road to get one, however I feel like if this really is what I am experiencing, the management of ADHD will greatly improve my quality of life. I just want some support, and progress on this. I am concerned that my lack of support on this will cause me more harm than good.