Even if recommended by your doctor, it is always your choice to have or not to have this surgery. But, it is important to understand the possible consequences of delaying or refusing surgery.
Without bypass surgery, you will remain at risk for the progression of a serious and life threatening illness. Though no one can truly predict the outcome of your specific situation, it is possible that you will continue to experience poor health and possibly the loss of your life. Furthermore, if your symptoms persist and worsen, the risk of complications associated with having bypass surgery at a later time, rises dramatically. At this point you may no longer be a candidate for surgery.
The final decision to have or not to have surgery rests with you, but all concerns related to this decision should be discussed with your doctor at length.
Then you and your doctor can discuss your individual situation and come up with a treatment method that is comfortable for you.