It could be allergies acting up your asthma. You do need to tell someone so they can monitor it. There shouldn't be a reason why you need to go to the hospital unless you have a sever asthma attack.
I think you should try taking anti-histamine when your asthma attacks, I think it's just allergy, mostly asthma attacks when a person with asthma holds or stay with hairy pet like cat or hairy stuff toys.