The first time I OD'd I freaked out afterwards and texted one of my friends and told her what I did, then fifteen minutes later her and my other friend came to pick me up to rush me to the ER... I was totally out of it. Scared them to death, but they still speak to me as though it never happened. So they forgave me for being an idiot.
Your situation wasn't even your fault and you handled it fantastically. You have nothing to feel bad about.