Feeling crappy after blood drawn

I finally had my first appointment yesterday, and it was such a relief! All is well. We were there for two and a half hours though with all the intake testing they needed.

They drew my blood last, which stunk because I hadn’t been able to eat since we got there. I had a Gatorade with me but forgot to pack snacks. They took SO MANY vials, and I’m not a big person.

Since then I’ve had a massive headache. Drank a ton of water, ate carbs, fruits, veggies, cheese etc — slept with an ice pack on my head — but still today I am dealing with this headache.

Did you experience this? How long did it last?