Hi Bigmarti,
I am by no means an expert, however I have been in a similar position to you I.e Robbing peter to pay Paul. I would gather as much info as you can on ALL your previous lenders, collate in a spreadsheet, Gasp at how much interest you have paid out over the years. And then send out an email to all companies expressing dissatisfaction about how the irresponsibly lent you money or rolled over a loan so much that they took advantage of your generous nature... The key focus is these companies need to be viewed as being "fair". If you have evidence they may not have acted responsibly or fairly then the FOS would most definately look into your accounts.
One thing I would suggest doing though is contacting Cashgenie TODAY, they have been paying out left right and centre for these kind of things and you may find they have no money left by the time they receive your complaint.
Many people on this site will be able to help you with any letters, however I would refrain from getting angry/irate but give an honest letter/email, stating firstly, why you are complaining, how these loans affected you at the time, why rolled over, E.g couldn't afford to pay back due to loss of work, other payday loans, snowballing effect, affordability, should they have given you the loan. And finish up with what you would like to happen, and obviously last but not least ending with if they do not answer satisfactorily you will of course escalate the complaint to the FOS.
Regards
Jake..
Information is from complaining about irresponsible lending with Wonga and QQ, the former being satisfactorily settled and the latter I am still waiting for.