Fluoxetine and Letrozole

Hello folks,

I'm wondering if there is anyone in this community with experience of low mood being exacerbated by Letrozole. I have been on Fluoxetine for many years but am finding after six months on Letrozole my mood has become very low. Does anyone have a similar experience and what have you done to alleviate it? 

I have an appointment with a GP to ask about it but would like to read about other's experiences and fixes.