Calm down. Breathe. Everything's ok, I promise.
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What you're feeling is perfectly normal, and understandable. But you need to cut yourself some slack. You've been here two months. Eight weeks. That's no time at all! And it's like Phatbeetle said-- for some reason, most people seem to hit a wall right around this point. It's just one of those things. Two months in, I was ready to go home, too. But I'm (usually, mostly) glad I haven't.
It's not a great situation right now, with not being able to work or drive. It would drive anyone nuts! Throw in wedding planning and the associated money worries on top of that, and you should be commended for not having flung yourself off a bridge yet! (Please don't fling yourself off a bridge.)
Things
will get better. Right now, just try to relax. Focus on your wedding planning, and on getting to know your way around. Try to make yourself go out of the house, get familiar with local public transport. Hop on a random bus or train and see where it goes. Explore!
Even though you can't start working or volunteering yet, there's nothing stopping you from looking. Check out the website for your local volunteer centre, or Volunteering England/Scotland. You can see what sorts of opportunities are available in your area. You could even pop by your local volunteer centre for a chat, just to see what's happening in the area, and let them know what you're looking for and when you'll be available. There's also nothing to stop you from polishing your CV, looking through job ads to see what sorts of things are available, etc.
Also, remember-- no matter how remote or isolated your new community feels, there's more going on than you think. It can be really hard in small towns, but if you really look, there's stuff out there. You just have to dig for it.