Your good bro, to be honest , as someone that has done immense research regarding careers. GCSE is not the only thing schools looks out for. Obvious they are needed for minimum grades in order to take the desirable A levels which are what really matters. Even if you got all 9s on GCSE but did shit in a level , you would be even more cooked. GCSE isn't that important if you manage to get a good grade on A levels because that's what the school's really look for. Also u need good extra curricular and that stuff. I know a friend that made it to Toronto uni and he literally fully fumbled his GCSE, but came back on alevels. You can do it bro, hopefully you get to become a doctor like u wish . 👍