Tip sick
From the unofficial Duke TIP Wiki
The feeling that something as amazing as TIP might never happen again. Most commonly experienced by fourth years the day after leaving, but TiPsickness can occur in a TiPster of any age group, whether he/she is a first year driving away from the Davidson Campus or a third year still sitting on the Quad of East Campus after everyone else is gone on that last Sunday.
Symptoms of TiPsickness include but are not limited to: