I doubt that cataracts are forming in a few short weeks, and I agree with giving it a few more weeks then talking to your doctor. There are many ways to adjust dose or even try a different therapy.
I took tamoxifen for 5 years like very many women do. Some things like the emotional feelings and the irritability did get better when my body adjusted, as did the cramps. I did use magnesium frequently at the beginning to help with that.
My doctor recommended systane gel drops several times a day for the dry eyes which seemed to alleviate the dry eyes while working on the computer.
I eventually added sertraline (antidepressant) lowest dose to get through the 15 years endocrine therapy.
Adjusting your dose or even trying a different medicine is an acceptable way to keep your eye on the prize, which in its simplest form is not having a relapse, treatment for or dying from breast cancer.
It was not always easy and the hot flashes and dry eyes remain 20 years later, but I love to say “ I have had 20 years to complain about it😂”
Are you comfortable having these conversations with your doctor to find an acceptable path through this?
Can you think of all the reasons you are going through this mostly annoying treatment to begin with, like family, friends, or love?