So sorry to read that you are experiencing these side effects with Letrozole. I have been taking it for 1 and 1/2 years. Want to respond to the problem with dry eyes which I’ve had since starting the medication. You probably already do this, most people seem to, but I have increased my fluid consumption and that seems to have helped. I’ve noticed so many carrying water bottles so took a clue from that. I’m elderly, should know better, but think several weeks ago I became slightly dehydrated.
Sincerely hope you can resolve or diminish some of your other symptoms. It’s a struggle.