The pain is not in my ab, it's in the pit of my stomach just below my breast in the center. It does not radiate into my arm, it's under my arm, almost a half circle around my body into my back. The pain burn in my back, but is a constant ache in my stomach. I have no appendix, lost those 18 yrs ago. I weigh 139 lbs, I started a weight loss program 3 weeks ago and have lost 13 lbs. I'm taking Phentermine 37.5 mg one time a day, I am having acid reflux when I lie down. Ocassional bloating. I am certainly stressed because my husband is serving in the Army in Kuwait and I'm single parenting 2 children ages 8 and 11.