I get sick 12 times in a year, what should i do

I am a 28 years old, male. my problem is that ever since my second grade, i have been getting sick almost every month of the year. It would last from 6-10 days almost periodically (ie, it is like a cycle, if the first month i get sick on the 6th, next month would be on the 2nd). My conditions include headache accompanied with fever (with or without common cold), sore throat with white lesion, lesion or white patches on the tongue, dizziness and even inflation of the gums. I would take medicines but this would upset my digestive track and i get bloating, cramps, and acid reflux. although i hardly ever suffer from coughl. The doctors i visited would ruleim it as low immune system or allergies.I have had several checkups and testing done but almost all comes back normal. this condition has affected my life  and i feel like its useless to even do anything about it. 

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