You really will need to get that maths GCSE up - that's probably one of the major sticking points. Have you looked at the option of doing a GCSE equivalent, such as Key Skills?
In terms of careers in health that don't require a degree, have you thought about becoming a healthcare assistant? They work in hospitals, and do a lot of the hands-on care that nurses have traditionally done. It's often seen as a good way for people applying to medicine to get experience, and so being an HCA can only help you in any subsequent applications to uni.
Perhaps dental nursing would be an option? It doesn't have particularly high academic requirements, and I believe that people tend to learn on the job.