Don't know is this is from the vaccine or Covid. I had Covid in Sept. 2021, which was quite mild. I occasionally have pressure under my left breast and it spreads around to my back. Mostly on the left side of my back but once in a while spreads to the right side. I become short of breath and fatigue sets in. It lasts about an hour. I comes at random times. I have had a physical, blood test & stress test and everything came out fine. I have been told to see an allergist, which I have not done yet. Could it be from inflammation? Does anyone else have these symptoms.