To go through a ‘dry spell’ is to spend a period of time without something that is needed, or without something one is accustomed to or desires.
Example of Use: “Sam is a great salesman, though lately he’s been having a bit of a dry spell.”
Everyone has experienced dry spells now and then. The origin of the idiom 'dry spell' is believed to be the late 1800s or early 1900s, though no one is certain when the phrase was first used. What is known is that the word 'spell' was first used to indicate a period of time sometime around 1845.