it may be that the fact that u have chronic lyme saved your life. having a chronic infection that keeps your immune system practice for years is exactly why i heard some specialists recommend flu shots as severe covid prevention. which is also covered by some papers
https://www.webmd.com/lung/news/20201102/get-your-flu-shot-it-might-shield-you-from-severe-covidand im not sure what do u mean by very ill with covid, but if u did not require extra oxygen, that does not file as "very ill" these days ;)
time will tell