Years ago i had bloodwork done & felt very faint/ill. tmrw i'm getting some done due to possible poor circulation & dehydration issues...will i be ok?

Vasovagal: Many people, especially young ones, get a vasovagal reflex (dizziness, sweating, fainting, etc) with certain procedures. Although this can be very frightening, it is not dangerous and may not recur. Staying hydrated, having a light snack before a procedure, and laying down during the procedure, should further reduce the chance of experiencing this again.