Hello sir..
You seem to have allergic rhinitis/ bronchitis...well you need to make sure that you are well protected from dust,allergens, pollution, pollen, etc by following simple practices like covering yourself well when you go out...dust free environment, ac is also a trouble so get filters checked,avoid curd,banana in the night when you have cold... Try to keep yourself warm..maintain helathy habits..do some regular breathing exercises... Take steam..you need to include more of green leafy vegetables and
vitamin c rich food like lemon,amla etc to build up good immunity..you can se well take vitamin c supplements