Hi Scrumpy, I'm joining you a little late here, wasn't around last night. You are not alone, there are plenty of stepmums on mn who are or are going through a similar , me being one. For what its worth I'll share my experience with you, sorry this may be long. I "inherited" 2 boys who also lost their mum when they were 1/3 and we all moved in together just before the youngest started school. The oldest boy has generally been an angel although as he's now 13 we've entered the awkward teenage phase! The youngest however has been quite frankly a nightmare. His behaviour at school, at home, on holiday, at relatives, in restaurants, you name it, has been appalling and many times, violent. As he didn't have a great start to his life, we just put his problems down to that, so did school. However, things took a turn for the worse a couple of years ago when he threatened to hurt himself. We then realised we couldn't handle this on our own and asked our GP for help. He joined a long waiting list at the nearest child and family unit. Finally he saw an Occupational Therapist and Child Psychologist. Because of his background he had automatically been put in the "attachment issues box" (as I call it) and received one to one sessions with the Therapist. He almost enjoyed going, although this was probably because he got the afternoon off school and his behaviour improved in some ways, i.e. his violent outbursts would be 1/2 a week rather than most days. The general day to day hassle of life with him, inattentive, impulsive/lack of self control, defiant, refusing to do any request (including any homework, didn't care if he was threatened with detention), behaviour did not however improve at all. After further investigation we discovered that although extremely bright (IQ of 126 at 10!) he does have some specific learning difficulties, for which he is currently being assessed, so we are told some of his behaviour is simply out of frustration. The Therapist/psychologist are for the moment, keeping him in the attachment issue box but we are going to ask for further investigation ideally through a paediatrician (see my thread of yesterday special needs: any experience of fragile x).
I have no great advice to give but I know in handling my dss, I have learnt to let the little things go including the state of his bedroom and I am determined to explore every avenue for an answer to his problems, otherwise I will feel as though I've failed him.
Does your dss have any learning difficulties? particularly as he's having problems at school? As for threatening to self harm this is probably because he is unable to control a situation and he gets overwhelmed (this is what we were told anyway). You need to take that seriously, go to your GP, go on your own/or ask for telephone appointment if he refuses to go with you.
More importantly, take some time out now and again just for you, away from that family situation, it really works for me. It's very hard to stay strong all the time but you can do it. I valued my relationship with dh too much to just walk away.
I hope in a little way this helps, really just to know you're not alone LMBx