My take is that virus get in blood system, causing clog resulting O2 level go down. Aspirin helps. I did take Aspirin 325 mg w/ IVM since day 7. Now nearly two weeks later, my O2 level back to 98%.

Virus takes steps to get in. Initially on upper respiratory, then lung, then blood. That may explains why vaccine break through but result in light syndrome cause vaccine antibody does not work till virus get in the blood. However, blood clog may be related to the spike protein so vaccine could be more dangerous cause it come into blood system directly. There is theory saying those adverse effect may due to vaccine injection into the blood vessel instead of mussle, which I think makes sense.

Regardless, not a good news for both recovered and vaccinated. If I have to choose, I choose early treatment with enough quantity of medication as early as possible. Vaccine? looks like one dose every half a year just too much risk.