Resitting A-levels due to extenuating circumstances for Med school

Due to domestic violence throughout my life I have experienced a lot of difficulty with my studies, poor mental health and night terrors which still make it difficult for me to go about my day. For reference I was originally taking a gap year so I have not applied anywhere yet.

My head of year will apply for extenuating circumstances to the exam boards after a-levels but I still don’t think I can get the grades I need to get into med school. I think I will need to resist my a-levels and use those grades. However I don’t know how this will affect my chances of getting in and I’m so anxious because I feel like there are such little opportunities to be accepted.

I just wanted to ask if anyone has applied to medical schools with extenuating circumstances and gotten in. I am planning on applying to Exeter, Glasgow, St Andrews and Newcastle as they’re the only ones that would really accept me.

Also, I know that some med schools and exam boards only give extenuating circumstances if the situation was just before exams but because this is long lasting would there be anyway to prove it has affected me for a long time despite the abuse stopping?
I tried to talk to my GP about my mental health and anxiety but they just said I was stressed out from exams and don’t want to listen to me.

Any advice or suggestions from anyone would be greatly appreciated.