Hi PoTs, op here! Hope you are doing ok!
So sorry to have been awol from the thread again. Have loads going on currently but I will be starting a new thread shortly as we are approaching 1,000 posts on this one.
A warm welcome to all lurkers and newcomers, Mumsnet virgins included!
It's great to have you with us on, although sorry that teen antics have driven you here.
Retrievers (forgive me if you have already mentioned this but I haven't caught up with thread yet) is your dd able to access any support outside of the immediate family at all? I remember reading somewhere on Mumsnet that one is only as happy as one's unhappiest child so this must be especially tough on you 
Kassy it is overwhelming and soul-destroying so it's totally understandable that you are feeling very up and down too. Tbh, I started this thread because I felt very very beaten down by a combination of my dd's behaviour and the menopause etc and various life events. And I felt that it had all become a bit of a vicious circle. Like Sandwiches despite the odd glimmer of light, I really couldn't see an end to it. But all I can say that having got away this summer, and dd having grown up a bit, despite the odd meltdown here and there, things have improved a fair bit, even though I really thought it wouldn't. So please hang in there. 
MamaBraddaz sorry things are so tough all round for you currently
Hats off to you too for dealing with teen angst when ill yourself and with your dad being ill too. In one of the many books I have read about teen behaviour (can't remember which one) it says that those teens who are most attached to their parent(s) are those who sometimes find the process of evolving in to an independent adult (which after all is what teen-hood is all about) the hardest and most difficult, and so it's often those teens who project their internal struggle on to us in the most, shall we say, emphatic manner possible!! So, confusingly, it could be because he is so close to you that he is being so scornful ifyswim. I know that doesn't help much in a way, but on the other hand, it is kind of comforting too ... .
It's kind of like when married guys start being horrible to their perfectly nice wives all of a sudden, because they want to leave the relationship for someone else. And in order to do that and justify it to themselves, they have to cast the wife in the role of villain (if that makes any sense at all!).
Beholder 
Sorry, must go to bed but will be back tomorrow to set up third thread! G'night all!
Most important of all, hang in there PoTs. As has been said many times on this thread, people don't talk about their tortuous times with their teens because of shame, weariness, bewilderment and fear of being misunderstood or judged, but trust me, you are NOT alone!