Yea mine was negative too I kept a list of my symptoms that have disappeared since I went wheat free..

Indigestion, sour stomach, pain in my stomach all the time
acid reflux, nausea, acid indigestion, with occass. vomiting.
brain fog, depression, sadness, irritability (I'm a real B on wheat) also get it when I stop wheat and gluten … as withdrawals for a few days sometimes a few weeks in the begining when I first gave it up.
No focus and concentration, lethargy - no energy and sleepy all the time
Feminine rash, Mentally affected, and blurred vision, plus I just crave more and I'm never satisfied..I just want more wheat products..I was more hungry all the time. Off wheat, my appetite is normal which feels really weird because you get used to being hungry and craving all the time as a norm. Now I'm like eh, I'll eat if I get hungry. It's a nice feeling. I have that even not on the CAD. I like the CAD because it controls my sugar intake. I need CAD control for that.