With FAP, the entire digestive system is involved, and sometimes there are other syndromes attached. I lost all my lower teeth - they literally fell out, and not from lack of care. And I had pins to hold a plate, but that did not last more than a year of good use. Then the pins came out a while back, and after a bone graft, we are hoping it will hold two mini pins - new tech stuff so I can have a few teeth. The top teeth are not involved, only the mandible. Look up Gardner's Syndrome. I also had a tumor when I was 20, and I have the keystone spot in my eye that assures you of FAP. However, no one knew about it then. I am 68, and Dad died at 56 - the longest living with "it" at that time. Gram died in her late 70s, but they had removed all the offending organs earlier. We go back 5 known generations, and one niece has it - she is in her 40s and about where you are with it.
No one who studies it can believe my situation - that is why it is so unusual, and we are really hoping to make some breakthroughs. You should know by then to watch carefully for thyroid cancer - it is fast and aggressive.
The Whipple is not an 11-hour surgery to just remove the top of the small intestine - but please consult with someone who is really on the cutting edge. I don't know if that could be done some other way, but for sure it is not easy to deal with the feeding tubes, etc. But if it gives you quality of life - I don't consider quantity important - just real positive quality - then by all means go forward. I think you can manage FAP enough (never gone as it is DNA) such that, as my doctor said, he does not think "it will be the thing that takes me out" - but one never knows. Be sure you have all the views - camera, etc. - done, and when you decide one way or the other, give it all you have. Be confident and positive, and it will make all the difference in the world. I am 2 days short of 6 months from the dual surgery and have recently been subbing at the school, taking care of grandkids after school, keeping up with some of the farmwork (not like before), and maintaining the property by myself. I was really frustrated the other day because I wasn't at "my old speed" - but realized just how much I was doing and just said "be thankful"!
Also, ask about the internal wrap to prevent adhesions. You can do whatever works. I did not have any choice as I was loaded with tumors, and they were hot for cancer. I really do not know how I dodged the bullet over these past 28 years, but I gave it my best, and I am very thankful each and every day. I think the duodenum is the critical mass that triggers all the mess in the pancreas, etc. If you can get ahead of it, do so. Also, the stomach mass will occur if it has not already. So if it has, get it all done at once. The stomach will, in less than 6 months, heal and stretch to a good size again. The ileostomy pouch is what it is, and you will really have to adjust your diet to match what digestion has been removed, and it improves weekly - every Sunday I could see marked improvements - sometimes it was how far I could walk, other weeks how much better I was eating, how much I could do between naps, how well my concentration improved. I jotted little notes on the calendar to monitor my "mini-milestones". I could write a book - so let me know what and how I can help.
Keep me in your loop, and if you want to talk to an amazing doctor, I can send his name to you. I wish you all the best, and I am already praying for you, the decisions that need to be made, and your outcomes.