Jet lag happens when you cross a number of time zones it can last several days . Some symptoms are headaches (there are a few more symptoms).
There is no such word as jetleg. However, there is a word called jet lag. Jet lag is when a person feels extremely tired because they have traveled across different time zones.
Jetleg- which is moving from time zone to time zone
a temporary interruption of the body's biological clock, experienced when someone travels across time zones, by airplane. This includes fatigue and irritability