Outside of medication, your main other option is an ablation. Ablation is a procedure where they thread a catheter through a vein in your groin area up to your heart. They induce your arrhythmia and determine the cells that are responsible for causing the irregular rhythm. Once identified, the doctor ablates (burns) the cells that are causing the problem and effectively stops them from doing what they do.
The risks here are lower all the time. Originally, ablation was a very risky procedure as it was practiced rarely and few doctors had the epertise to do it. However, over the past 5 years or so, the procedure has been increasingly studied, practiced and perfected and is a viable and fairly safe option for many people who suffer from chronic arrhythmia. The cure rate for A-fib and SVT is fairly high with ablation. However, PVC's and PAC's are not as easy to induce, identify the source (usually PVC's/PAC's have more than one source) and ablate.
You may want to ask your cardiologist for a referral to an Electrophysiologist for an EP study. A general cardiologist deals mainly with the anatomy of the heart and irregularities that can cause damage. However, and electrophysiologist deals with the electrical signals in the heart (and other muscles) that induce muscle contractions and are more familiar with the cause and effect of ectopic beats. Once you've had an EP study to indicate the source of your arrhythmia, they will discuss with you further options that may lead to a brighter (less thumpy-bumpy) future. :-)
Good luck.
Has the doctor ever discussed ablation for your situation? What type of medications are you taking? Are you symptomatic?