I Am 14 Years Post Op From Gastric Bypass Surgery

I am 14 years post op from gastric bypass surgery with the weight-loss of 115 pounds. I was 37 years old at surgery time. I gained back 30 pounds and reached 262 pounds. I am now 51 years of age . I have since gone on a regular traditional weight loss diet and now I'm feeling a little dizzy, a little nauseous, and having some stomach pains. The diet is going very well as I have lost 37 pounds in four months. My stomach pains feel like there's an ulcer there. What do I do next besides seeing my bariatric doctor?