Oh and you can try vitamin C, echinacea,
or any other immune boosting products, but if there is an
allergy or mold
or something causing this, it won't do any good.
https://www.webmd.com/vitamins/ai/ingredientmono-981/echinacea
https://health.clevelandclinic.org/3-vitamins-best-boosting-immunity/
Also, make sure you aren't smoking, wash your hands frequently, and are getting enough sleep (sure, I know that's easy when you have bronchitis).
Feel better!