Why do I keep getting sick is my health just going down im barely 28?

I was sick for the past 3 weeks. First it started with throat pain then my ear started hurting. I went to the doctor and got a round of antibiotics which made me feel better for a few days but after i finished the antibiotic the throat pain came back with vengeance. I though i could make it go away naturally so i loaded up on onions, garlic and honey but to no avail it would not go. I returned to the doctor for another round of antibiotics. The doctor did tell me i have post nasal drip so i got some allergy medications and another round of antibiotics and It finally seem to be getting better but still have a mild cough but im feeling much better. I got sick on may 23 and it's already June 13 and i still got another 5 days of antibiotics. Im barely 28 what is going on with me?

Why do I keep getting sick is my health just going down im barely 28?
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