About a week after my COVID booster I began symptoms that started with being extremely cold and shivering, only relieved by a hot bath. I felt full and couldn't eat because my stomach felt full. And I was winded and couldn't breathe just after walking across the room. These lasted in varying degrees for about 3 months, after many tests and scans, which were all normal. At 3 months all were gone! Although I had all shots and never tested positive to COVID the doctors believe I must have had a mild case while traveling and never knew.