Glad your fealing better. A friend of mine got covid around the same time as you. Just when he felt a little better he got pneumonia, and then the Flu. He took a big hit physically and is just now able to do things without rapid fatigue. I have sciatica on my left hip, it rears it's ugly head when I don't get out and exercise enough. I feel your pain litteraly. Glad you figured out the chain issue fingers crossed for your next race.