Went & got the hep b vaccine & 2 days later donated plasma & when they tested it, it came back false positive. my doc wanted me to wait a while to test me & i dont have hep b. will i never be able to donate blood? even for a family member?

No worries: Every baby born in the US since the late 1980's probably has gotten the series of 3 Hepatitis B vaccines. Surely these kids all grew up and are donating blood every day in this country. The problem sounds like the blood bank has to decide whether or not a person has a real positive or false positive Hep B surface antigen test. Probably a person can talk with the blood bank physician about details.