internal sd card unmounted,please help

I have the philiz touch recovery and lollipop 5.0 based x-pop custom rom.After installing new rom,I found that only half the space of internal sd card was free.So Under settings-storage,i erased the contents of the internal sd card.It showed internal sd card unmounted.Device went off,the installed rom was gone too.When I go to recovery,it shows can't find/open sd card,wiping out data and cache fails,installation of new rom gets aborted. Plz help