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Sometimes knowing who your parents are from the beginning doesn't make it any better, though. If your parent is going to be a not-so-great one, maybe it's better to not have grown up around them in some cases. I'm sure it has to be disappointing for him, though. Even still, he gets to meet you out of the deal, and you're fantastic. Did the coffee part go OK, at least? Like...he isn't terrible? What's his name?
I can't imagine how your mom is feeling either, and she definitely doesn't deserve it. Finding out the truth after so long might be even more difficult than knowing it from the beginning.
As long as you're staying at home, I don't see why not. But drink a glass of water with it. Hydration is important.