Malaise thoracique après utilisation d'un oreiller ou d'un soutien surélevé autour du cou (1 mois depuis les symptômes)

Its my Day-37 Since onset of symptoms. I had fever and sore throat in first week. And terrible weakness and elevated heart rate thereafter, which still persists. I havent done any blood work yet.
I feel discomfort in the middle of the chest while using pillows or cushions while laying down.
The uneasiness increases if I do any physical activity. However it goes away in 3-5 minutes If I lay straight without any pillows. I am getting a little worried.
I dont have any breathing difficulty. My oxygen levels remain consistently good.

Has anyone else experienced this?