Why am I still low energy and headache after 4 days

20M. I don’t drink much but a few days ago I went out drinking, had probably 2 shots and 2 beers, some weed. But at the end of the night I felt like shit, threw up a bunch. Now 4 days later, I’m still feeling low energy and have a headache that keeps coming and going.

I can’t tell if it’s just a prolonged hangover or if something else is going on