If it helps at all, I believe we all feel very strong some days and other days it is as though something kicked the wind out of you. Sometimes I'm like, "BRING IT ON !!", and then the very next day is, "OH GEEZ, LEAVE ME ALONE I CAN'T TAKE IT NOW !!!". We can't be strong all of the time, none of us. It is the roller coaster called life. You'll be feeling good again and I hope it is soon.
My thoughts are with you,
MarchOn