[It'sNotLupus]

Thanks, Doc and TSandM, for your insights and counsel. My visit today with the ENT doc was indeed a "second opinion visit." This doc doesn't see much connection to diving, but won't rule it out. He has ordered a CT scan and ENG test (tests not even mentioned during my first two visits with the initial ENT) and ordered no diving for another 6 weeks, until the dizziness issue is resolved. I'll report back on the test results if there's anything fruitful to share.

One thing I did learn today: in the ENT community, there are some who reject or disregard the notion of perilymph fistula. My first ENT is of this school (even terming it "hocus pocus," which led me to get a second opinion.) (Apparently, some surgeons were quick to diagnose -- and then perform surgeries to "patch" -- perilymph fistula, to make huge gobs of $$$. That lead to a backlash, with many folks saying, perhaps correctly, that the diagnosis was merely a ticket to a fast buck in the OR.) My "new" ENT won't dismiss out-of-hand that diagnosis, and is including PF as a possibility.

So, while a diagnosis still hasn't been made, at least some testing is being scheduled -- which is of some comfort. Not thrilled that I cannot dive, as I was hoping for a summer full of diving adventures, but there's always... yardwork.