I wanted to welcome you to the board. I'm sorry you have to be here, but am glad you found us.
Parenting a difficult child is not easy. It is emotionally, mentally, physically and financially draining. It's very important that you take time for yourself doing whatever it is you enjoy, is relaxing - or stimulating - and is all about you and for you. Whether that's taking a walk alone or with a friend, reading a book, soaking in a tub, hiding in the bathroom with the door locked (ahem...sometimes it's the only place to escape to), or anything you can dream up.
I used to have a rule that the first 10 minutes after I got home from work were mine. I was not to be interrupted for anything short of a life or death emergency. From the time I got up, all day at work, then picking up the kids after it was nothing but demands on me and it was going to be demands on me all night, too. I needed 10 minutes to change clothes, decompress and switch gears. And, boy, if I didn't get that uninterrupted time it set the tone for the whole evening.
Post as often as you need to. We're here for each other.