I had slight swelling at the injection site and lots of itching, which apparently coincides with when the onset of the mcas. After that the intense thigh/calf leg pain started, also the joint pain. I'm starting to have arthritis-like issues with my hands (joints lock up) and my right wrist feels like tendonitis. All this plus the fatigue, of course.
Does any of this sound like what you're experiencing? Have you seen your doctor about the post-bivalent shot symptoms?