Even without a visible lump there may be cancer cells lurking. You're very lucky to have caught it so early. The Letrozole or Anastrozole is to prevent new or present cells from developing further. Most people on this forum are here because they've had issues while there are very few representing a very large number of people with little or no side effects. You may tolerate it, you may not. It's totally your choice whether or not to take the gamble. Many people in your position choose to go on the drug for peace of mind. Others don't. You are here for others' experiences, but it seems you are denigrating mine because it's not what you want to hear. I'll chalk it up to the emotional roller-coaster you're on now. We've all been there. Good luck.