Hi,i M Having Dizziness And A Lot Of Head Congestion.im

hi,i m having dizziness and a lot of head congestion.im currently taking flonase,saline nasal spray,also singulair.i have asthma. my doctor today wrote me a script for meclizine. im nervouse about taking it.i also take pain meds because i had back surgery in feb.im also a diabetic,medicancal heart valve,