What happened to me? Did i faint?

Okay so this morning after standing for like 20 minutes straight i felt sick with a head ache and stomach ache and kinda of clammy feeling so i lied down in my bed and a couple SECONDS after i started to lay down i start feeling myself trying to keep my eyes open and i kept blinking like i was falling a sleep even tho i WASNT tired. Then next thing i kno i am opening my eyes feeling better. I didnt even kno i shut them because i didnt remember doing it but after i woke up i felt alot better. Before i started laying down i wasnt tired at all and it was a matter of seconds after i did that i started feeling myself trying to keep my eyes open and i just remember me not being able to think straight before and after i woke up, but i do remember feeling sick.