Has anyone else experienced systemic hypersensitivity reaction?

My doctor says I’m having a systemic hypersensitivity reaction. Just curious if anyone else has been told us. I’ve seen other discussions of the side effect in this forum under more general term terms like malaise. I’m wondering what kind of discussions people who have it I’ve had with doctors. The official side effects from the manufacturer seemed to have lumped this in with fatigue.

For me, it means that 2.5 has been really effective and I’ve stayed at that but even after months, I still have an injection related reaction reaction so it’s worse closer in time to the injection where it feels like I am in the late stages of a flu.