Hi Rena - So sorry your mom is having to deal with all of this on top of her cancer! As Laurie says, dizziness and nausea don't sound like Arimidex side effects, though constipation and diarrhea can be. I wonder if she might be just as well off taking tamoxifen, which has much fewer/less severe side effects? I'd ask her oncolgist if perhaps she couldn't switch... As Laurie says, quality (as well as length) of life is something to consider, especially as you get older. Good luck to you both- PJH