I was diagnosed with ARVD 6 yrs ago and have an ICD.You certainly do have something to be concerned about. You need to have a full evaluation and should stop the exercise until it is done.
Insurance is such a major issue.
However you live in DC which is not far from Baltimore. If you are looking for someone who has experience and knowledge go to Johns Hopkins. There is an ARVD cinic there. You can also email the nurse coordinator from that site and ask her your concerns and coordinate an eval. Please do it soon.