Yes, the blood test for celiacs looks for antibodies, and if you are not eating gluten when the test is done, there won't be any antibodies to count and will get a negative regardless of whether or not you have celiacs. Like I mentioned, if you had a problem with chia you will likely have a problem with all the other grass cereals, which includes corn and rice. Everything really does sound like you have an allergy to something to keep eating, and the more your intestines get stripped out the greater your deficiencies will get, and any medications taken orally will be absorbed less and less.