Snorting - Snorted a small amount of ritalin and got sick the next day?

[DaveDaPsychonaut]

Well here's what SWIM did, SWIM crushed the pills, stired in some rubbing alcohol, and poured the liquid onto a dish (Without the stuff that sank, which SWIM thought was the binders). SWIM left the dish to evaporate, and it did. It didn't smell like rubbing alcohol, so it all evaporated.

SWIM snorted a small amount, and listened to some music with SWIM's eyes closed and SWIM did random stuff for the rest of the night.

SWIM woke up with a headache, did some work, and it became unbearable so SWIM went back to bed.

SWIM was very drowsy, and he seemed very confused. Objects were not recognizable at first, they mixed with other objects.

And here SWIM is, he finally woke up, but was very weak, with a strange lightheaded feeling.

Could this be because some bacteria or virus fell onto the plate and SWIM snorted it?