It really depends on what you actually want to do. There are a lot of professions that work in the ED:
Doctors
Nurses
Paramedics
Physician's Associates
Operating Department Practitioners
Radiographers
Phlebotomists
Pharmacists
Physios
etc etc.
Also, medicine may not neccesarily be totally out of reach. While I don't know much about the 2yr A-level rules, there are graduate entry courses which you can enter into having completed an undergraduate degree. It's a long haul, but worth being aware of.