getting in and out of shape I was recently really sick and stopped biking for about 2.5 weeks. Before that I was biking 10 miles per day for about 2 years. 

Since getting better I've been biking 10 miles per day for about 2 weeks. I am not 100% done being sick - I still have rhinorrhea, but I feel like I am unable to go as fast as I used to before the sickness. 

Am I just imaging things or did I really 'get out of shape' during my sickness? Has anyone else had a similar experience? 

(On a side note, I also think that maybe the winter is making me go slower - though there is a chance that I am crazy)
You're probably just still overcoming your illness. 2.5 weeks isn't really enough time to lose any noticeable amount of aerobic fitness for an average, healthy person.