fainting so many times and falling down lead to anxiety

Approximately 6 months ago I had my first faint. It was around a stressful time where I was making university application ( and didn't get into my 1st choice). The fainting became more frequent so I decided to go to the doctor. I had a heart/ head scan, blood tests, 24 hr pulse rate measuring and they were all fine. I did go to uni for a month but after fainting so many times and once falling down the stairs in the underground I start getting anxiety and quit uni to move back home. Naturally I started getting scared to go out. This eventually lead to anxiety and depression. Now the doctors have blamed it all on being psychological.. I don't think it is. I think it's is physical and now the anxiety and depression are making it x100 worse. I'm 20 and I feel like it's the end of the road for me. The worry of this is causing my parents to argue. It's putting strain on everything. I do think about ending my life but don't purely because i think it will destroy my family even more than I already have. Does anyone else get faints? know of any other things that can lead to faints? ear? stomach? would show up in blood tests? thanks for reading!