Re employment after ill health?

I worked in insurance for 14 years and then became ill. I have not worked for the last 4 years but am now well again. I am bursting with enthusiasm to reinstate myself in the financial sector to make up for lost time but i am now 38. I am looking to try something slightly different as i am getting nowhere when i apply in insurance. It would have to be financial because that's the only thing I have ever done. I also want to go back in at minimum £30K. I have always wanted to be a trader/stockbroker/IB but these may be too taxing as I'm probably too old now. The pain is the caveat that i need good sleep each night to stay well.

So the question is...what can i try entry level finance that pays well that allows me to sleep....impossible eh?