There is definitely a nasty virus or two going around, but as my daycare provider's doc told her the same virus can cause different symptoms in every one.
Lucy had it and her "tummy hurt" for like a week, but she was acting fine. She skipped dinner one night at the end of the week and went to bed early and then she was fine the next day.
Lexi had the big D, low grade fever, off and on for a week and general crankiness and not eating much and then she was fine.
DH felt really really really cold (probably had a fever, but he wouldn't check), really really tired, lethargic. It lasted for 4 days.
I had a weird headache behind my eyes for a week.
Daycare provider had a terrible cough, lethargy, fever. Lasted for about 5 days.
Co-worked ended up with bronchial pnuemonia.
I kind of think it was all the same virus manifesting itself in different ways. I would say it will likely last another 1-3 days.