3weeks ago my tonsils became swollen &painful I got a steriod &penicillin shot and felt better. Now my tonsils are starting to bother again/& swollen?

Tonsilitis. You should probably be seen again by a doctor (possibly an ENT). Do not know whether the penicillin was long lasting or even necessary, but if you are again symptomatic it is best examined by a knowledgeable physician. Good luck.