Sometimes taking a little time off helps to motivate me. If I push too hard, I can get burned out fast and then it's not fun--it's something I "have" to do. Taking a break seems to do the trick. Sounds like you might need a few days' rest to get healthy too. If you keep pushing yourself, you may never get over your illness or, worse yet, get worse and miss more cycling days than necessary. Being sick always gets me bummed out too.
Hang in there. You will do fine on your 50-miler.
__________________
"We don't stop playing because we grow old; we grow old because we stop playing." George Bernard Shaw
Luna Eclipse/Selle Italia Lady
Surly Pacer/Terry Butterfly
Quintana Roo Cd01/Koobi Stratus
1981 Schwinn Le Tour Tourist
Jamis Coda Femme