my right nipple has been hurting the last week. its been 3 months after cycle. i can only assume its an estrogen rebound. ive been taking 20 mg tamoxifen (since i have an rx for it and its cheap) as well as a low dose of 50 mg 6 bromo. im only doing this to get by for a few days until i can place an order. would Toremifene or Letro be a better choice? i know one is a serm and another is an AI. im just worried letro will cause another estrogen rebound since it brings estrogen levels so low. thoughts?