Yup. Mine turned out to be thyroid problems. I neglected it for years until I was so exhausted I could barely walk this summer. And could hardly swallow from the swelling.

Just had surgery in November. They found cancer but no sign of metastasis. Just anxious to get my thyroid levels and energy back to whatever is normal for my age (61).

I still manage one hard workout a week, either a 20-30 ride at my limit, or intervals on the trainer. And a couple of easier rides or spins. I'm slower and tire easily but, hey, I'm alive and riding.

But I've had to discontinue the back to back rides or spins, and force myself to get more rest. That's hard. Seems like there's always something that needs to be done and I feel like sleeping longer than 4-6 hours is a waste of time.

But I'm gradually changing my habits to suit whatever passes for reality.

And I'm taking more vitamins and supplements. I'll experiment with anything considered reasonably safe. But most don't seem to do anything: pregnenolone, DHEA, gaba, glucosamine, etc.

Maybe I need to reevaluate them after my thyroid supplement level stabilizes. I might be expecting too much from supplements.

CBD has a mild effect comparable to coffee. Seems like mostly hype to me but some folks seem to benefit from it. I'll drink coffee. It's a cost effective ergogenic and helps NSAIDs work better. And it's coffee. Tastes good and civilizes me in the morning.

Bromelain seems promising for mild chronic inflammation so I'll keep trying it. I got some mixed with melatonin and valerian root for sleep and it's effective without making me groggy.