Really struggling

Hi, I am really struggling with my mood it is so unstable. One minute I am happy and the next I am really mad, then I am upset. I don't know what to do with myself and I feel so alone, that there is no way out and not knowing what is wrong with me or how to fix it is just taking my whole life away from me. I just have this constant feeling around me that I can hardly describe. It is almost like breathlessness but it feels so uncomfortable like there is something pulsing around a dread feeling through my body. I write so much stuff down and I just get so anxious because there is always something that just triggers my anxiety, and it is never ending. Random thoughts just seem to trigger it for no reason, such as thinking about a TV show I watched or how much sleep I got last night. I don't know if I have ADHD or Autism because I have suffered with being the odd one out since I was very young and it was always attributed to being naughty. I haven't been able to get antidepressants at all because of COVID and being unable to contact my psychiatrist and my doctor unwilling to prescribe because I am under a psychiatrists care. What advice does anyone have for dealing with these thoughts? I worry that no one believes me when I say I may have a condition. I just want to be in control of my thoughts and emotions but I think I need some help medication wise. Is paroxetine useful for what I am suffering with and will it help calm me? Thanks for reading my long post Kyle