& need for antibiotics off & on indicate two elements in your problem. Allergy
causes recurrent cold .
Lac of resistance makes you more suceptible for infection every time you catch cold.
- I feel you need investigations to asses the both.
- get yourself tested for allergens ( Allergy detection test). & get a desensatisation treatment,if needed.
-Try to avoid exposure to the allergens.
- try to improve your geearal health by nourishing diet, regular physical exercises, breathing exercises.
- Continue preventive measures like gargles, vapor inhalation, even you are off the symptoms
Please consult ENT specialist
for specific guidance.