I used a condom & took plan b. 4 days later heavy period. 2 months later, very nausious & bloated/full. Neg blood test & norm period. Still sick?

Preg test is neg? If the pregnancy test is negative then you are not pregnant. Plan b would not cause these symptoms 2 months later. I would schedule an appt with your pcp or with a GI specialist to discuss these symptoms and look for nongynecologic causes such as ibs.