It does sound like it's connected to your bout of presumed Covid in Feb '21. Once we experience cell damage of any kind, it will flare up again and again until it's fully healed...if it ever does get healed. Every time I start to feel the symptoms of a potential chest infection, I usually feel it in my legs first since, for some reason, my immune system responds there - cell memory. It could be that anything that creates an immune reaction for you is causing all that pain to return.

I'm no doctor but if this is what's happening, the best thing is to just build yourself up through rest, good nutrition, and all those lovely, healing treatments and practices you are following.