jokingly punched a female friend

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i suffer from OCD, which has manifested itself since childhood through irrational fears of hurting people. I've had "visions" of raping/racially abusing various friends i've known over the years, and I tend to lose all sense of proportion.

the other day I was having a few drinks with a female friend of mine. We jokingly had a little playfight, she punched me in the arm repeatedly (she's stronger than me and bigger, i'm basically a twink), and I proceeded to punch her in the face. It wasn't hard, although somehow I caught her lip and it bled (not shockingly so, it was just a small cut). I would never consciously hurt someone physically, especially in light of the aforementioned anxiety issues. I don't get the feeling she was upset by it, and I'm going to ask her next time I see her, but from the sounds of it, is what I did unforgivable, or is it plausible to jokingly punch someone lightly in the face?