Hi, thanks for the query to H.C.M. Forum.
as commonly known as now a days is an infection of throat caused by streptococcus
infection and the drug which prescribed to you is penicillin V and very much effective against streptococcus so need not to worry.
2 nd query is that you heard that it might be meningitis
, NO, NO , not at all because symptoms which you mentioned don't match like a meningitis patient so please don't heed towards that.
Since you have taken 3-4 days calvepen so now your's throat is non-contagious so need not to bother.
Good luck , Dr. HET