If you can, doing mild exercise may help with not only stress, anxiety, but it may help you prolong things like CAD since it's so prevalent in your family. Easier said than done, but luckily for me I kept on with exercise even when i felt my arrhythmia's increase dramatically, I think that kept my heart strong and healthy for when my heart did stop.
Dr's are amazed when I tell them I walked 4-6 times a week and ran 3-5 times; while I was in Bigeminy. I felt my heart stop one night walking...did that stop me? no... I admit I'm a bit dense sometimes - heart stop, fainting and I got up and walked another 3 miles, not the smartest decision, but I was sure nothing was wrong with me.
You should have a full cardiac workup if you haven't, to see if you have any problems going on. Could it be your meds causing some problems? I know my system is really sensitive and I can't take alot of the beta blockers; the only thing I've found that worked for me was Inderal.
Talk to your doctor about exercise and make sure you're ok to go ahead with it and then put some precautions in line like having a phone with you; 911 on speed dial etc like others do, but don't let pvc's stop you unless your dr says and start slow and listen to your body.
btw...as long as your heart is structurally normal and there's nothing wrong; your heart can handle runs of pvc's and VT; here's some info that may help:
http://www.medhelp.org/user_journals/show/284968/Ventricular-Tachycardia-VT---Vtach?personal_page_id=861727 there's a woman that my cardiologist treats with 80,000 pvc's daily, she has no structural problems and he said she doesn't even feel most of them and no symptoms, made me feel bad complaining over my amount lol
I think people get scared over VT/VTach but it takes alot for the heart to stop. Before ablation I had 50,000 pvc's daily possibly more but that's what it was on the day I had my Holter done, after ablation I'm down to 10,000 pvc's daily and VT runs, PAC's PSVT and some stuff like you with Bradycardia. I had to have a pacemaker/icd implanted but I'm one of those rare cases and have other problems.
It may be helpful also to keep a journal of dates, times, symptoms if you have any and what you were doing at the time you have episodes.