In the last month i have had tonsillitis 3 times. at what point does a doctor starrt considering tonsil removal?

Tonsillectomy: The Criteria for tonsillectomy in Adults is: 3 episodes of acute tonsillitis yearly for 3 years, 5 episodes yearly for 2 years or seven episodes in one year. Each episodes of tonsillitis should be documented with one or more of the following clinical features. temperature>38.3 degrees, cervical adenopathy, tonsillar exudate, or positive test for group A Beta Hemolytic Streptococcs

Depends on age: and co-morbidities. If you are otherwise healthy and had real tonsillitis (not just a sore throat) 3 times in one month, you should see an ENT specialist, because surgery might be recommended.