My brother has this permanently, though whether a delayed reaction to the booster or from when he got COVID itself (a relatively mild case) not long after, there's no way to know.
It has been a major detriment to his day to day life though. Any physically involved hobbies are impossible; just walking up a flight or two of stairs now leaves him completely winded for several minutes, as his heart rate also takes longer to come back to resting than before.
He's seen all the specialists. I think they ultimately came down on neurological damage, and tried a battery of drugs until they found some that slightly mitigated the problem. Last we talked about it, though, it hasn't been fully resolved.
It has been a major detriment to his day to day life though. Any physically involved hobbies are impossible; just walking up a flight or two of stairs now leaves him completely winded for several minutes, as his heart rate also takes longer to come back to resting than before.
Would not recommend.