Very insightful question and I think you may have answered it yourself. It is possible that you bleed into a muscle sheath. Small amounts of blood in a confined area can sometimes cause more pain than a large hematoma. It is atypical to have that much pain after a PVI. There are nerves that run close to the veins but it is unlikely that they are affected because your artery is between the nerve and vein -- they would have to stick pretty laterally to hit the nerve. Besides, nerve pain would likely affect areas more distal to the groin rather than the groin itself.
I think you should stay in touch with doctor and keep calling if the pain does not get better. They have done the appropriate tests and it sounds like you don't have a pseudoaneurysm or fistula.
have you talked to the EP doctor about this recently since the pain is getting worse? This is the situation where being able to examine the site would be very helpful.
I hope this helps and that you feel better soon.
AS OF SUNDAY I HAVE HAD 3 GOOD NIGHTS REST AND PAIN IS NOW SOMEWHAT ON THE DECREASE. I HAVE AN APPOINTMENT WITH MY EP DOCTOR TO DISCUSS WHY THIS HAPPENED AND WHY MY PT/INR WENT FROM 1.6 TO 6.3 SO FAST. ALSO TO DISCUSS THE PROBLEM WITH INTER MUSCLE BLEEDING FROM HIGH PT/INR NUMBERS.