@briarrose
I had Letrozole for few months. First came the aura headache every week along with dull pain in the head, then a full blown migraine that woke me up at night and lasted a few days. Now I switched back to Exemestane which gives me mild petechiae. I don't think all the side effects come from lower estrogen. They could be the reactions to inactive ingredients in the drugs. Try to see if switching to Exemestane would help. I can put up with joints/muscles pain, but headaches are terrible! You're a tough one. I can't stand headache every day. I only take Exemestane every other day to prevent severe petechiae. I hope once my body is used to the drug, the petechiae will go away and I can take it every day. Best wishes to you.