Please! A doctor that told you not to complain??Tell him to walk in your shoes for a week!!Please don't be afraid to relay any concerns or problems that you are having with your doctor-he is there to help you through this and is being well-paid to do so! If he seems unapproachable then try talking with his nurse, they could probably help you and could relay your concerns to the doctor.
I think that you will find this site very helpful. Doctors and nurses can give you a lot of valuable information, but many have not walked the path themselves. The practical advice given here can be very helpful, just remember that everyone reacts differently to treatment. The PEG tube should be very helpful, having the proper nutrition is so important, it will help your body to heal quicker.
I wish you all the best,
Liz