Definitely do the EPQ - it's a project/essay where you pick your own topic and a question and you do your own research on it and it could be absolutely ANYTHING!
Also, you would have 2 ASs and 2 A2s, you'll have to work incredibly hard the next year and possibly take a gap year but it is still possible to get into uni. If I were you, I'd choose a different AS and take a gap year to do the A2 of it so you have the standard 3 A levels for university, the EPQ will also give you credit so don't panic!