You had a fascinating career and I can see why you miss it. I retired in 2008, am 10 years older than you. I was happy at first, but now , especially after Covid and being in isolation phase for so long, getting older every day.... not so much. Health issues keep popping up and now with this darn mite problem , I spend most of my time making one doctor appointment after another or checking drug side effects on rx.list. org . I hesitated using the metronidazole but I think you used it successfully. One dermatologist said it had to be used twice a day and would take 8 to 10 weeks to kill them .