skipped beats

i used to have about 5000 pvcs in a day  which would go off with a small dose of beta blocker (1.25 Concor).  but due to asthma i cant tolerate beta blockers over a long period.  recently i  did a holter and was having 20000  pvcs in a day. my cardio put me on steroids to improve my asthma for a week and then on beta blockers.  the pvsc went down significantly, but again the problem is with betablockers i have severe asthma.  i am also hypothyroid on eltroxin 150 and 137.5 on alternate days and had a aortic valve replacment in 2003.  anybody any suggestions?

i do feel lightheaded when i get the pvcs and a liitle faint ..  are they dangerous in these numbners  and what do i do?

[stutterheart]

I don't know but perhaps you can get more info from also posting on the other pages related to hyperthyroidism and asthma to try and triangulate.
What does the beta blocker do that makes you asthmatic?