Words of wisdom/help?

I feel like people ask this all the time, or want reassurance, but I need it now. I have been thinking too much again about the idea that i'm going crazy or something somehow BEYOND crazy where I"m completely sane but with crazy thoughts or the worst feel in the world, although that's what I get now. Is it the panic feeling, that sometimes i just feel like there is no escape from anything, my mind and body get warm, and I feel like i need to run somewhere, run away somewhere, even though I know that there is no where to go really. I KNOW that this problem is doubled by thinking about it, but i just can't stop thinking about it. I think i have some feeling that there is something that if i think about too much, i will go crazy, crack, go insane. Or I will disappear. I just feel so empty and so forsaken and like everything is completely pointless now...i don't have any happiness, really. i'm constantly worried about how i'm going to feel or what I'm going to feel. Sigh. Thanks for listening to me rant again guys