What do you want us to do? You have already done half your teaching course - stick with it, then you will have something else to fall back on if you can't get into nursing (and much as we need nurses, the NHS budgets are being slashed by millions at the moment). It won't look good when you apply for a 3-year nursing degree course, to say you withdrew yourself from your previous university course because you didn't like it - sorry if that sounds harsh but it will show. Also, to be a nurse these days, once you are qualified you will find that you are often supporting students, teaching new nurses yourself, etc. - a registered nurse with a teaching qualification will be valuable. These days in order to start to teach in the NHS you have to have some sort of teaching qualification, either Cert Ed or PTLLS or similar - I'd hang in there if I were you.
What are the thousands of applications you've sent out, for what, to where?