Entry into the veterinary profession is even harder than getting into (human) medicine. You'd need at least 3 grade-A 'A'-levels in maths and science. (Even if you could get 4 starred-A grades, there'd still be no guarantee of acceptance onto a university course).
As Jenna suggests, you could try to become a veterinary nurse but again there's a great deal of competition for places on the relevant courses. See here for details:
http://www.learndirect-advice.co.uk/helpwithyo urcareer/jobprofiles/profiles/profile169/
For further possible careers working with animals, browse through the links here:
http://www.learndirect-advice.co.uk/helpwithyo urcareer/jobprofiles/category10/
(In particular, I suggest checking out 'Animal Care Worker')
There are very few full-time jobs available which involve music (except those which require a great deal of advanced study, such as an orchestral player). Why not learn (or brush up your skills on) a suitable musical instrument and seek to join a local band, playing local gigs? You'll probably not make a fortune out of it but the best semi-pro bands get plenty of work and I'm sure that you'd get a great deal of satisfaction from performing.
Chris