A month ago I had a throat infection, full fever, nausia etc. Was given antibiotics which cleared it but now have recurring pain when I swallow.?

Tonsils inflamed. The throat infection may have been incompletely treated, leaving a low population of bacteria within the spaces or crypts of the tonsils, and after the antibiotics are no longer a threat, repopulation can occur. This is how chronic tonsillitis develops. Chronic inflammation of tonsils is common in those who have deep pockets or cryptic spaces in the tonsils.
SEE YOUR DOCTOR. If your throat is still having pain, then you need to see your doctor.