Obsessions and surgery

Hi there.  I'm new to this so if I ramble I apologise.  My son Kieran is 12, he has many disabilities, CP,Hydrocephalus, Autism, ADHD and Epilepsy. He has had obsessions before, convinced he's got a mucky bum all the time, picking spots he creates himself, clothes....but now he's sticking his fingers down his throat to make himself sick.  He says something is there, there is nothing to see.  He is doing this all the time, on top of his constant bathroom visits to clean himself, (though nothing is there), I'm losing my mind, I cannot magine what his hea must be like.  He is due to have major surgey in a month, I have a care co-ordinator who is doing nothing (CAMHS) I have messaged her 4 times this week, not one reply, she has't seen Kieran except once in over a year, we cannot get any help at all.  They were supposed to be giving something to calm the bairn in hospital, but his psychiatrist went on maternity, now the new one says he won't because of the Epilespy, but no-one can tell me who to contact.  I'm about to sack CAMHS tomorrow, I'm very lucky the school has a great Autism specialist, but I'm terrifed about how the bairn will cope in hospital,he could really harm himself, if infection sets in it will be straight into his bones as he's having the whole of his left leg from the hip broken and re-aligned.  I'm so sorry for ranting, but I need to say this out loud, I'm breaking in two :(