Well, everything turned out OK. As soon as my wife got home, we discussed my symptoms. She reminded me that every few years this has come up. It is one of the results of the explosion I went through in my commercial diving days. It hasn't happened in years, and I had forgotten about it. We all have these crystals in our inner ears and they can become dislodged and cause major vertigo problems. Initially, it can be caused by a severe trauma (like an explosion). Several months went by after the accident before I was able to see an ENT about my condition because I could barley walk. After a few physical therapy sessions, they tried some kind of maneuver to get the crystals back in place. They also said that it was likely to happen again over time. And it has. They had given instructions on doing a home remedy maneuver, in case it happened again. My wife helped me to do it, and it worked. I no longer have the severe vertigo. My wife has now placed me back under the rule of not going anywhere or doing anything without my phone on my person. Just in case I might be outside and fall down. Then I can call her or somebody for help. I hate carrying my phone everywhere! Anyway, thanks to all who were concerned about me. I am OK, and back to being my wonderful self that you all know and love!