I had long Covid for about a year. Was hospitalised for a week. All symptoms cleared up after my 2nd Phizer shot. It is 6 months later and I have been doing relatively light exercise. On Saturday we did a hike in the mountain and I pushed myself to the limits, thinking nothing of it. I was so tired after that and have dyspnea very badly. Could this be long Covid returning or just a phase my body needs to regulate itself. (I had double pneumonia). Thank you