Urgent help me decide where to apply!!

Hi everyone, I study Maths FM Physics and Econ with AAA*A predicted in them respectively. I would like to study Maths and Econ or MMORSE at Lse and Warwick and MAYBE MAYBE Cambridge but feel discouraged due to my A in Economics. My GCSES were 7-9 with a 7 in Maths, 2 of my relatives were extremely ill during that time but the school is refusing to write that in my reference. I also have had a lot of mental health struggles to the point I was referred to get medication by my school and wasn't prescribed it as I'm not 18 yet. I am so worrjed I'll fail and honestly the TMUA is killing me too, I get a range of scores from 5.7-7.4 and it just depends on the paper for me. I feel discouraged and don't know what to do. PS I am sitting the October sitting because I don't want to drag out the TMUA revision until Jan as I feel so behind already in YR13. Any help/advice good or bad would be greatly appreciated,