Help! I slept with my uncle?

I didn't know he was my uncle. We use to hang out all the time and we started liking each other. We thought his dad was his dad until his dad needed blood one day. It showed that it's was impossible for him to be his son. So his dad told him who his real dad was and it's my mom's dad. I feel sick to my stomach, I haven't ate in 3 days. What can I do? We slept together over 20x because we had started dating.
Help! I slept with my uncle?
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