seasonal allergies. /asthma

i get seasonal allergies every april til about june. my symptoms are your typical allergy symptoms and also i get a non productive constant cough. the doc said it was cough variant asthma. i get a shot of kenalog and have to use an inhaler for about 2 months. the kenalog doesnt do much and the cough is an all day thing for the better part of 3 mos. is there any alternative herbs that would help?? thanks Tweet