Thank you all so much for taking the time to offer advice, especially ST24Mondeo. I will check this out thoroughly.

My husband suffers from Parkinson's disease, diagnosed 13 years ago. We have 1 child at home. My husband claims incapacity benefit and gets dla(middle rate) and mobility allowance(highest rate). I am 49 and have not worked since I was a teenager, have 5 children. We had a really bad time 2 years ago, my 16 year-old daughter walked out of home to stay with her boyfriend. My husbands illness and depression got worse, home-life was hell, and I got very depressed too, years of being a full-time carer and my daughter's situation really wore me down. My daughter had no means of support, boyfriend no job, we gave her what we could to help her out. Then she had a baby, we helped there also. In desperation for a break from the stress at home and for some money to help my daughter and the baby I took a job filling in for girl who was going on maternity leave. Didn't think that it would last more than a couple of months if even that, or if I could even do it, my self confidence was nil. Never signed a contract and never knew how long they'd keep me. Pay not good. Very stupidly did not inform dwp. As things turned out they kept me on to cover for other staff taking leave. Girl I originally covered for had another maternity leave, and is due back next month. In this period my husband has been getting £44 weekly Income support in addition to his Incapacity benefit. I have also been getting Carer's allowance - I hadn't checked this properly and thought that my husband was entitled to this for someone to help him out, now realise that the number of hours I work rules me out of claiming this. My daughter has been coming over if I'm working and we've been paying her fares, I take time off when he's too ill to leave with anyone else. In addition, I've been getting housing and CT benefit. I have been told that I could have been claiming Working Tax Credits and Child Tax Credits which would have covered this amount. My boss has had a letter from DLA fraud investigation asking about me. I don't know what to do. I might not even have a job when the girl comes back. Should I give up the job and wait for dwp to get in touch with me - my husband thinks it would go better for me if I was back as his full-time carer, that they might be less likely to prosecute? Is it too late to stay in the job, come clean and change claims? Do I tell them how long I have been working and offer to repay overpayment? How long would they give me to repay? Would they still prosecute? I am absolutely terrified of being hauled up in court. I am so ashamed and so worried about this, nerves are in shreds. If I get prosecuted I'd lose job anyway and would probably never get another at my age anyway even without a fraud conviction to boot. What would be the best thing to do to limit the damage? Thanks in advance to anyone who can give me advice.