Hey there,
I was diagnosed between six and eight months ago (sorry to be so vague, but I was quite poorly at the time and can't be more precise as to details) and I felt dreadful when I heard. I thought I'd never feel better.

I'm fine now (well, a little insomniac, but that's nothing compared to where I was.) Hang on, and give the meds time to work. There's no point taking a drastic decision that can never be undone, like suicide. Things can and will get better. No mood will last forever. Have faith, even if just a tiny bit, and see what the future will bring. If I could get better, I'm sure you can too.