help with asthma?

i used to have asthma pretty bad when i was a kid. but i havent had it bother me in probably close to 10 years... well all of a sudden in the last week it started acting up again. i made an appt for thursday to see my doctor to get me an inhaler or something, but until then i dont have anything to take, is there anything i could do that would hold me over until thursday morning? my chest is getting tighter and its getting harder to breathe...