BEFORE YOU DO SURGERY, GET YOUR VITAMIN D LEVEL CHECKED.  Many people have incredible food allergies due to vitamin D deficiency.  If you are vitamin D deficient, your doctor needs to get you onto megadoses immediately.  You may have a chance at saving your intestines if you do this.  Since you have celiac disease, have your doctor contact one of the vitamin D scientists/specialists listed on my profile to find out how to best get vitamin D into your system and if you should be tested more often than others to check if you are absorbing the D at all.  Celiac disease can lessen your ability to do so.