Terrified of going to doctor

I have had hill things I ety all of my life. I am now 71 and although I thought I was dying most of that time of some terminal disease, I basically been pretty healthy up to now. I have had stomach issues on and off during my life but Sticking to a bland diet for a certain amount of time, the stomach issues would subside. In recent months however, They have been more severe and seemed to be related to either gall bladder or ulcer. I have also had recently more issues with constipation than I ever had before So now I'm convinced I have: cancer on top of everything else. I have an appointment for a physical on September 21st that I've already put off twice but I know I can't do that in a longer. My family is aware of my health anxiety and have been pushing me to get these tests done and not put them off any longer which I know is right but the pressure I'm getting from them is making me even more terrified. What can I do to muster the courage to go through all these tests Without collapsing in fear. I hate the fact that I am such a coward in this regard when I have been so strong in so many other areas of my life. Any words of wisdom would certainly be appreciated.

Remind yourself 'I'm the boss. The Dr. can't make me do anything I don't want. And, if there is an issue it's better to know now and so something about it then it be there and ignore it.' Not to mention there could be a little something that isn't a big deal at all.

Don't rule out anxiety as possibly being the problem as well. It's amazing what anxiety can cause which then makes one feel anxious which then...and endless circle.

I wish you well.