Bugger it!! Just wrote a long message, someone called me and then i lost it! 
Ah well start again!
Hee hee try not to worry. If the bleeding gets heavier and increased pain ring your MW. Rest and distraction might help take your mind off it, easier said than done though I know!
Beeble, your day sounded so bad
I feel for you I really do. I know your going to hate me but can you try and flip the negatives into positives? I try to do it all the time and feel much much better. For example, I didnt get the job I wanted when I gave birth to Dd, and i was gutted! Really sad. But people made me realise it wasn't all bad. I had less responsibility, my current job didn't change= less stress and the person they chose was an airhead (and at the time, I was like, she will never make it! Lol). I also had a lovely daughter, a fantastic husband who cared for me and it all made me feel better. I hope you can find a way of seeing any positives too. 
Dameflat I read your post about ds not sleeping and it took me back to when my Dd gave me the same probs! Is he in a bed? Can he get out of his room? I did the suppernanny thing ( very hard but so worth it) and now she is a very good girl going to bed. I can give you some tips if you like.
Fjordmor, the teenage step daughter seems really tough. I have absolutely no experience in this situation but do nurse adolescents from time to time, so understand the challenge. Do you feel you should talk to your DH to ask for more support, it seems really unfair to make you out to be like you said the horrid step mum! Discipline is so important, and teenagers just want control. Does the suppernanny do teenage tips too?
Marie x