I'm 24 weeks with di/di twins. Lately if I do any activity, I mean any, my heart starts racing like I've run a marathon and I feel it pounding through my whole body, I feel really faint/exhausted, and now my feet look blue? I'm not crazy, my 7 year old saw them and was freaked out. Anyone else have this, is it normal to feel like this with twins? All I did was unload the dishwasher this morning and I'm beyond tired. Help please.