Make sure you check out Dyshidrotic eczema or Pompholyx and see if this resembles what you have. I get it every year (even right now), sometimes single tiny blisters on any random finger and sometimes all over my hands (both). They have clear fluid in them. They never burst on their own, either, just dry up after a couple weeks / month or a little more. Just a thought. Good for you to get it checked out, but like Grace said, insist on cultures even if the doc doesn't want to. Hindsight is 20/20 and you'll feel better you did, I just switched my doctor for this and now I have a very knowledgeable doc who I have all the confidence in the world in.
the only way to diagnose whitlow is to get a lesion culture done of active symptoms. This needs to be done within 48 hours of the appearance of them.
Odds are you have never been tested for herpes with all your testing. You'll need to look and find out. Even if you do test + for herpes on an igg blood test though, that doesn't mean that this is herpes - that is why the lesion culture is so important.
grace