Thank you so much for replying! I will admit that, when I found this thread, I started crying because I'd finally found other people who understand what it's like to have anxiety. Also, as you said, I feel like my anxiety has been getting worse as I get closer to the exams, but they're not the sole cause of it.
My mother knows very well, too, that depression and anxiety exist; several of her cousins have suffered with depression, but with me, I think she just thinks that I'm stressed. My A-Levels subjects aren't anywhere close to easy, and during the first term of Year 12, I was still trying to set up a routine for my prep, as I was working until about 10 o'clock at night, trying to finish all the work I'd been set that day, and I just kept getting really stressed and worried about it all. I think that's how my mum sees it.
I haven't been to my doctor yet, so I haven't been 'officially' diagnosed as having anxiety, but I've been reading up on it and it all just... fits. But, as I said in my first post, because I'm coming up to my A-Level exams, are they going to listen to me and take me seriously, or am I just going to be listed as yet another stressed or attention-seeking teenager? I'm even scared of going to see the counselors at school again, because if they feel they have to, they will contact my parents and tell them I'm having issues with my anxiety. And that would just circle back to my mum seeing stress instead of anxiety.