HAW
You must be going through hell. There's been a multitude of advice on here and to answer your original question calmly and objectively, you could try your GP, Women's Aid, Childline, or the NSPCC.
On a slightly different note - I always knew this site was a hotbed of oestrogen (it is MUMSnet, after all) but Christ on a bike, this thread takes the cake. We still, only just, live in a society where innocence is presumed until guilt is proven, yet you lot on here have tried, convicted, and castrated the OP's husband without so much as a second thought.
Teenage kids can and do lie - a friend of mine had allegations of this nature brought against him by his own dd when she was 13; she has been put up to it and coached - Coached! - by his ex-wife just so she could have sole custody. He was a dog handler at the local nick, and was suspended from his job; it took six months to establish the truth, after which he was depressed to the point of being suicidal and had to take long term sick. This was 6 years ago and he only started back in the job late last year.
I myself had sexual assault allegations brought against me at work by a 18-year-old girl, when I was an 19-year-old trainee shop manager. She was upset at being shouted at by a customer; all I did was touch her shoulder in a gesture of support. She lodged a complaint that I had touched her inappropriately and in a sexual manner. She was on a disciplinary, saw me as a way out of that situation and was angling for sick leave and compensation or constructive dismissal. Luckily for me the conniving bitch was overheard bragging about her scheme in the pub next door to the shop and was promptly given the boot. That whole affair was 20 years ago now but to this day I am very wary of being left alone in a room with a female colleague, because frankly I don't trust you lot any further than I could comfortably spit a rat.
If the guy is guilty, then lock him up and throw away the key; he deserves to have his life ruined. Trouble is, if he's innocent, the poor bastard has already had his life ruined anyway; because neither the OP or the rest of his family will ever look at him the same way again.