Those doctors r not very helpful sometimes, r they? ( :
You're certainly not alone. If it is serious enough that u can not sleep, then that in itself can be a real problem. There r medications that MIGHT help, such as beta blockers (like propranolol & metoprolol), but these all have a bunch of other effects which it would be better to avoid if u can.
So u might want to try some lifestyle changes. Chocolate, caffeine, alcohol, & exercise can all be triggers that increase the frequency of ur arrythmias. Unfortunately, so can stress - so worrying about whether u can get to sleep will unfortunately only make it harder to get to sleep!
Deep breathing will help u relax, & some people report that magnesium, calcium, & fish oil supplements can help too.
It is worth a try, anyway. If none of those work, u might at least get some consolation from others with similar problems. The first link below is to a forum that seems to have a number of people with PVCs & PACs. Hope that helps!