Hi everyone, I'm 18 and live in the UK.

I came across ADD & realized it describes me perfectly. I've never completed full time education, I changed jobs 3 times within a few months(and quit the job I LOVED on impluse) I also changed tech classes 3 times too.
I went to a doctor(I avoid doctors at all costs as there usually wrong for me) she told me ADD dosen't exist in adults, that theres no treatment for me and that there not going to help me. I'm literally on the verge of a breakdown. She referred me to the mental health team(but said this will take months) I really don't know what to do, my family don't speak to me and the only ones who do say I'm making it up or looking for an excuse? The few friends I told said I was just looking for a mental illness because I'm bored?? (No-one understands my situation at all)
Its been a month since I seen the doctor, I know there is no services within my country for ADHD.. does anyone think I should go see another doctor & try to get some help "again". I know because of the ADD, ive became depressed so I don't know whether I should go back to the doctor and explain I'm depressed too. I told the one I saw how horrible I felt and she woulden't help me. I'm just sick of pouring my heart out and getting the same response. I have no support from anyone and literally at the breaking point.
Can anyone tell me what to do?? I need an actual diagnosis so everyone will stop giving me such a hard time about my life and so I can start my life again. I've lay in bed every day for the past 4-5months.. I really can't deal with it anymore.