I started Ibrance and Letrozole a week ago on March 14. First couple of days ok. But since then I feel very weak with no energy. All I really can do is sleep, appetite is gone and I feel like it’s hard to breath. Are these normal reactions to the Ibrance and Letrozole. I didn’t feel like this with the verzenio and anastrozole. I didn’t have the feeling of limited breathing and just wanting or falling asleep anywhere. Am I on drugs that are not for me. Please let me know if anyone has had same symptoms as I have. Thanks