I apologize as it appears your post has not been noticed by many of us.
The key question in your diagnosis would be whether the tumor has invaded the muscle layer of your bladder. If that is the case yes, bladder removal is the normal standard of care. The second key is you had a second TURB which is also standard on high grade tumors. This is to confirm the margins include muscle to properly stage this. If you are only stage 1 (non muscle) and not 2 (muscle invaded), then saving the bladder with agents like BCG are usually a good option.
Ask further as you go.