I need some help

Lately I feel like my anxiety has been worse then it has ever been before. I feel like I'm a ticking time bomb about to explode. Anything can set me into a deep depression or even anger. One thing is I can't understand why I'm so hurt by one of my friends going around hooking up with my friends and not me anymore. I mean we're both single we have that right to do whatever we want. Its just I feel like it was special between us or at least used to be. It rarely happens anymore and when it does I feel as though he doesn't even really feel it like he used to. I don't think he realizes how much he is hurting me by hooking up with half the people in our group or telling me about these girls he is talking to on dating sites. As much as I wanted to be with him I feel as though I can't do this anymore because its tearing me apart. I have had my stress level at an all time high my period is a month late this has happened before due to stress and its happening again cause my stress is probably worse now. I'm tired of being the nice one and always being pushed around by people I believe to be my friends. I'm tired of being stabbed in the back multiple times and I'm tired of always being lied to by people I really care about. I feel as though right now no one cares about me as they did or claimed they did. I feel very worthless cause I can never do anything right anymore. I'm a screw up everywhere I go. I can't advance at work because I'm way to slow and as much as I claim I try my hardest it just is never good enough for anyone anymore. I can't pay my own phone bills or car insurance. I can't afford my own place or to help pay rent with a few people. All my money is being wasted on fast food. My friends are taking advantage of me and my car. I may have even lost my car too. I might have a damaged transmission and timing belt so that will cost an awful lot to fix and I really want to help my parents pay that back. I'm trying really hard to not spend so much money but it seems I carelessly swipe my debit card and my money goes away faster then the blink of an eye. I would love to be able to see $1,000 in my account or even more. I just really need help. I need support. I want to know who I can call a true friend because I'm slowly learning who I can and can't trust and each friend I lose hurts me even more. I want to get help and see if this anxiety is actually something major or minor. I just feel as though there is no one who can actually help me anymore and that I'm better off on my own to suffer. My way of self harm is actually hurting my head to the point where I bang it on walls or hit myself with something like a bottle or even my phone. Lately all I been doing is watching my roommate play playstation 3 but it seems ever since we got that system it is all he ever does anymore.