Thanks for writing your query.
After reading your post, it seems that the cause of your recurrent throat infection
is improper treatment.
The infection can also recur if your immunity is low.
You should get a latest throat swab culture done and take proper antibiotics as per the culture/senstivity report.
Also take antihistaminic like Fenofexadine
120 mg once a day along with decongestant like phenylepherine. This will help in controlling the post nasal drip(nasal secretion dripping into the throat).
Warm saline gargles will also be helpful in relief from your symptoms. You can take fresh fruits and vegetables add Vitamin C supplement
to boost your immunity. Always wash your hands before eating as this prevents entry of infective organisms into our body.
Also get yourself examined and investigated by an ENT specialist
and take any medicine under medical supervision only.
I hope this is helpful to you.