Passed out during a blood test...HELP?

[i try so hard]

Today I passed out during a blood test. I was getting it done to see if I am pregnant. The nurse had put the needle into my arm and it hurt....a lot and she wasn't finding the vein i guess, I was just staring at my arm and i got tunnel vision. everything got fuzzy and silent, i was spining around. The next thing i know I am on the floor and she is screaming for another nurse to come in.
She didnt even take any blood, I had passed out before she could.
Could anything be wrong with me, I am really scared to go back to get it taken. I dont know what to do! Help please