Make The Temptations Go Away!

Hi guys,
So for a while I've been feeling the temptation of selfharm. My emotions are full blown when it comes to anger/sadness and can't think straight, then feel as if I'm about to. But then I feel myself kicking back in. Everytime I feel as if I'm losing control and it's going to happen sooner or later. I never done selfharm, as in breaking skin, in that way. When I'm crying or feel sudden pains of anger, I feel as if I'm not in control and ready to do something drastic. I think bad thought sometimes and I'm afraid I'll act on them. My parents don't have the money for a therapist so I'm not sure how to deal with this. It sorta sounds like Borderline (I think, am I right? The exaggerated emotions, feeling alone, depending on other's emotions, feeling hurt by other's even if it wasn't meant to, I think. Please kindly correct me if I'm wrong), but I have no diagnosis of anything.
My question is: how do I keep myself from possibly pursuing these temptations?

i am not expert just researching but i think its borderline. i might i have borderline but i have never done selfharm, i just feel like i want to kill or cut something.
for me to cope with that feeling i do handimade crafts or write what i feel in song or book, i think if you found hobby it would help you overcome this problem.