I am sorry to hear that, it is good that you are working on your mental health as that is definitely important.
You have a few options.
1) You could apply to a russell group through clearing on results day, normally the grades are lowered but this may be risky as it depends on if there are spaces left on the course.
2) You could take a gap year and apply next year through ucas when you have your alevel grades as you will be able to 100% receive an offer as long as you meet the entry requirements.
3) Apply for the foundation year course (if available) instead as this would naturally require lower grades than the 1st year course and you may be able to move onto it before starting uni if you achieve higher than the foundation year requirements