From my childhood i used to have periodic tonsillitis now it happens less last i had sore throat was 1and half year ago, could i have rheumatic fever.

No data to assess: People typically have more throat infections in early childhood than they do later. You ask about a specific complication of untreated strep disease, but have offered no reason why we would ever consider the diagnosis. You need to start over and offer why you are thinking of it, because what you have stated so far has no relevance to the diagnosis.