Tamoxifen - different brands, different side effects

https://www.bcna.org.au/understanding-breast-cancer/treatment/hormone-blocking-therapy/

A very good resource for you to read.  Side effects are different for all.  You maybe one that doesn't have any or maybe one.  My personal brand is Sandoz however it doesn't mean that brand will suit you.
Best wishes as you settle into the next phase of treatment