No no go to a doctor -even if its not her! My mental health got in the way when I had to do a retake last year, and it really ruined me, so I went to the doctor a couple of days before my exam and got a prescription and he wrote a letter to uni explaining my situation (even though it cost me a bomb), but I may have not passed without it depressingly... now I'm on my year abroad and it costs so much for meds that I can't do anything
so itll be an interesting thing to explain to my doctor when im back home hahah! but you'll be glad you've done it
It might not help you to recover over night, but you'll be able to request a letter for your exam boards. It'll help, I promise. I wish I'd done it through my GCSEs