Hi PJ
Oh yes I am afraid so, I was on Tamoxifen for 3 years and it basically puts you through the menapause chemically so the side effects can be bad, mood swings, hot flushes, aches/pains, headaches etc etc these are just a few, your partner would not mean to be moody it cant be helped Im afraid and she has obvioulsy been through a great deal and still is with the tamoxifen , it really can be horrible even though it is a wonder drug
L x