Dear rohithjohn, sudden loss of erection is mostly due to stress
and tension as you told that recently you recovered from fever might be viral fever
post viral fever gives lot of fatigue
and may you had tried sex , that time your body and mind was not ready . relax have a gape of one weak from sex dont try to perform or asses your erection . this temperory phase will go . try to enjoy the romance and foreplay not with the intention of penetrative sex take fruit juices, plenty of water, rest relax you will gain the vitality you can have mutivitamine tablet named ATOZ GOLD
. FOR A MONTH JUST AS SUPPLEMENT . YOU WILL BE FINE . DONT TAKE STRESS TO BED ROOM.