2 weeks ago swollen glands, post nasal drip, cough. Got a z-pack- better. Swollen glands are back so is drip. Bad throat pain. Have seas. Allergies to?

Allergies. You might have allergies have you tried any OTC medication for allergies like Claritin-D or just plain Claritin along with steroid nasal spry And try saline nasal spry see if does work. If your glands still inflamed you need to see your PCP or allergist.
Well... indiscriminate use of antibiotics is not recommended for upper respiratory infections because they are usually VIRAL. At this point a culture is in order and avoidance of smoke and pollens. Use a humidifier .
Ca be from. allergies. Go back to doctor and be rechecked to see if it is the allergies.