Hi Thanks for posting your query on HCM I have read and understood your concern. Since his problem comes only with change in climate or when in contact with paint smell, his problem will most likely be of allergic origin.In this case, the treatment will be to avoid the allergen(what triggers symptoms). However, evaluation by a Pneumologist will be very important.A chest x ray and if need be, repiratory function tests may be requested.In the meantime, the following may help: -Avoid triggers like paint smell, cold, dust... -Take an anti-histamin like benadryl and a steroid like prednisolone and a mucolytic like carbocysteine 5 % If his Doctor feels his symptoms may be of infectious origin, antibiotics may be prescribed. Hope this will help.You may wrtie back if more concerns. Best regards Dr Mbuomboh