Nausea, upset stomach, weak, forceful heartbeat, lightheaded, 30 lbs weight loss. had endo/colonoscopy(dec 2013), ct of abd, blood work. what next?

Reevaluation: Typically, the evaluation of unusual symptoms initially focuses on ruling out the most likely and the most dangerous causes of symptoms/findings. When workup does not reveal a problem, we reevaluate. Sometimes the symptoms or physical findings have changed, making the diagnosis more clear. If not, we consider the less likely/less dangerous ones. If workup complete & no answer, seek 2nd opinion.