Hi and welcome to HCM. Thanks for the query.
In such cases it is recommended to do preoperative radio or chemoth to reduce tumor
size. Then it may be operable. You should now do frequent red blood count check,eat easier food and use stool softeners. If there is low hgb you need blood transfusion
. Also take iron supplements
. For pain relief you may need some stronger opiate
painkillers and sitz baths may be helpful too.
Wish you good health. Regards