I have been taking Citalopram for years and in October 2025 was diagnosed with Grade 2 breast cancer. Lumpectomy and Radiotherapy followed and now I'm on Tamoxifen for the next 5 years. My GP wants to change me to Sertraline instead of Citalopram because of the questionable interactions with Tamoxifen  but I've read mixed reviews and not sure ..can you give advice please