EGO is a very intrusive mod and should not be used with a proper update.
Arcane Fever is stored in the LastFlattered actor value. It is stored as a negative number, which means 10% is -10, 50% is -50.
To reset Arcane Fever, you can modify this value to made it equal zero. When, for example, your Arcane Fever is 70%, run player.modav lastflattered 70 (setav will not work as you expect, use modav)
Arcane Fever is stored in the LastFlattered actor value. It is stored as a negative number, which means 10% is -10, 50% is -50.
To reset Arcane Fever, you can modify this value to made it equal zero. When, for example, your Arcane Fever is 70%, run
player.modav lastflattered 70
(setav will not work as you expect, use modav)