PIP Mandatory Reconsideration

Hi I'm waiting on a reconsideration for pip I had a heart valve replacement 3 years ago I suffer with angina and awaiting tests for thin vessels disease I can't work more than 50 meters I'm very forgetful and can't stand in 1 spot for more than 5 mins as the blood circulation in my legs is very poor. The lady who assessed me said completely different and scored me 4 on both care and mobility I can't even shop for myself never mind clean my house any ideas if my reconsideration doesn't work as I've been told most of them they don't even look at them.