Hello!!! Congrats on your surgery date!!
Prepare for a long post! Mastectomy pillow (amazing for sleeping and chilling u can rest ur phone on it): https://www.amazon.com/dp/B00EE84FZU/ref=cm_sw_r_cp_api_i_PJKE73KFY88MG63F7G2Y?_encoding=UTF8&psc=1
Bed wedge: Great for staying elevated for the first few weeks while sleeping! https://www.amazon.com/dp/B08SG4B7F3/ref=cm_sw_r_cp_api_i_4SDGA07NQ8HYCTH7WC5A?_encoding=UTF8&psc=1
Lap desk: Great for doing stuff on your computer or doing art! Also great for eating in bed: https://www.amazon.com/dp/B085JZ2SPX/ref=cm_sw_r_cp_api_i_77ATPX7SB7MZ977J1B3W?_encoding=UTF8&psc=1
Pregnancy pillow: Any one will do! I bought mine second hand for 10$. I’m 3wpo and i still use it!
Lastly: my list of other items that aren’t necessarily essential but definitely helped.
Hope this helps! congrats!