Nelly,
If you type in retrain as a teacher into Google, there is plenty of data - as a cautionary tale look at
http://education.guardian.co.uk/teachershortag e/story/0,,727038,00.html
As far as Medicine is concerned, there is almost nothing. It costs arouns �200,000 to �250,000 to train a Doctor and the competition to get into medical college is fierce, so if you want to go in for this, you will really be on your own. I was talking last weekend to a lady who did a degree in History at Oxford before deciding she wanted to do medicine. She had to fund herself through college to get the necessary "A" levels at the right grades to get into medical school. She is having largely to fund herself via student loans and family help to complete the 5 year course. My nephew who graduated this year in Medicine at teh same university, worked before he went back, and has a degree in Pharmaceutical Chemistry so would appear an ideal candidate - but without financial help from his parents and all his savings would not have made it.
If there is help there it is pretty well hidden!!