Struggling with Mental Health and Seeking Advice

Hi everyone! I mainly downloaded this app to gain some advice - I've been trying to get a diagnosis and potential treatment for whatever is going on in my head. I haven't had anything officially diagnosed yet, but I have been struggling with (what I've labelled as) panic disorder since about 2016, anxiety and depression since 2014 (when I started secondary school) and social anxiety for as long as I can remember. I have also come to realise in the past 3 or 4 years that I may have ADHD or something similar as I have been researching different types and their symptoms - many of which I have been displaying since childhood. I have previously sought help through the NHS, which resulted in me being put on a waiting list for over 8 months, and then recieving 6 sessions of CBT. I didn't really find this helped me at all because I wasn't able to complete most of the tasks I was set, which then made me feel worse. However, my therapist did quiz me before we started and from that told me I most likely had anxiety, depression, social anxiety and panic disorder (we spoke more in depth about this during each session), but I'm not counting this as a diagnosis. Honestly, I'd really like to sort myself out because I'm so tired of shutting myself away, missing opportunities, and watching my friends drift off and go on with their lives.