Sayang, this sounds like it needs a doctor's check right away, please call your clinic or go to the hospital, especially since you're only 7 days post-C-section. That combination of sensations + dizziness + palpitations shouldn't be ignored, okay? Could be many things, but only a doctor can properly assess you now. A few of us mum friends have had post-op complications that seemed random at first, so better to get it checked out today rather than wait. Take care of yourself!