You could always ask your surgeon to write you a fit note if you don’t feel ready to go back to work, especially as your job requires heavy lifting. I have my surgery this coming week ( not with mya) and I was advised at my pre op that if I need a fit note,I should just ask. Hopefully I won’t need one as I’ve booked 2 weeks off, but nice to know I can ask if I need to. I know you said you are a bank worker so don’t get paid if your off but at least with a fit note you should get statutory sick pay ( not great, but better than nothing). Good luck