Sounds like emotional stress got the best of you, OP. Assuming another breakup attempt is underway; may I suggest having someone with you next time? To hold your hand maybe or just hold onto you, period.
I don't understand this reasoning? It can be a really stressful situation, especially if the relationship was unhealthy or abusive. Some people don't deal with conflict well. At least she's trying.
I broke up with my boyfriend two weeks ago and I was sweating to death, I was so scared of what he would say but in the end he didn't even care and now I'm more happy then ever.
"DON'T DO IT"
PS: hope you didn't hurt yourself too bad, op!