Running

I don’t want to sit around and do nothing.

For me the hardest thing about running is taking recovery seriously. If your body is telling you to stop and sending so many strong signals, you should listen (actually you should listen before you have trouble sleeping etc.). So right now the harsh truth is probably that it's not about what you want, but what you need.

The training plans I use have recovery weeks that drop the km/week to about 60-65 %, and reduce tempo runs. But that's when you don't have already overexerted yourself, so I doubt if that would be enough in your case.

just go for long walks, stretch, do some light joint and tendon focused exercises

When I'm training I do 3 up one down. Building three weeks, then the fourth week I drop back one week in duration. This is usually good for mid plan recovery, for just general recovery, I'd say do 75% of your normal work load. 2 shorter runs and a walk, 2 lighter lifts and a plyo session, in general recovery is doing less, not nothing at least for me.

Good luck.

Drop your mileage and intensity until you recover.

Do 25-40 percent.

Sounds like you picked up a cold, flu or covid more than anything