Welcome to HW! This is a great site for listening -- and lots of helping hands tapping away on keyboards too! :)
You sound a lot like me ... I'm in my own slump. I have a good job too, but every month I send a huge whack of it towards paying off the debts I went into to get to this point. I pay off more than I have to, but I just can't stand being in debt anymore and I want to get it all paid off as soon as I can -- so there's never a lot left (no nice treats for months -- scrap that, *years*!) One thing that really helped me to get some sort of financial plan together was advice from a site called The Motley Fool (http://www.fool.com/ or http://www.fool.co.uk/ if you're in the UK). Loads of info that I never even considered before, and my finances are *definitely* on a better footing than they were a year ago.
As for my job... well, it doesn't make me happy at present and deep down I know I want to change (well, not very deep don these days!), but the finances stop me from doing this. So I'm sitting it out till they're in order and I've made up my mind what I want to do instead. I get the sense that I'd go for anything just for a change right now, and that ain't good!
I get very nervous and play things over in my mind too -- or at least that's what I was doing to a really excessive degree until I went back on anti-depressants about a month or so ago. Things have got a lot better now. I still get nervous, but the depression has lifted a lot and I'm not having panic attacks and such. Have you ever talked to a doc about these things? It might help you to go on something for your anxiety for now, just to get you through the slump.
Really good to meet you.