I'm going through a similar thing with my spouse (also un-jabbed, un-masked). Things haven't been the same since we came down with covid, and after a long series of testing the best Corporate Medicine could assess was "symptoms of unknown cause." (One doc said flat out: "It's all in her head. A panic attack.") We then found the FLCCC long-covid protocol, and it gave my wife her life back---from being bed-ridden for 6 weeks to 85% functional now.

After six months, we've found that mild dehydration is still a trigger. When she gets too hot, or goes too long without water intake, her system starts ramping up histamines and then things fall apart 12-24 hours later. So we keep an antihistamine (Zyrtec) on hand to recover quickly when a histamine attack starts and keep the water flowing.

Prayers Up that your hubby finds the healing he needs. He's not the only one, long covid is real, and it can adversely affect lives. But that's not to say that hypochondriacs and attention seekers won't attribute their own sense of symptoms to 'long covid'.