Hello rajeshchandani , greetings from healthcaremagic.com . I have gone through your case history and I would have expected a more elaborate history from you as this is not enough to come to a meaningful conclusion . It is very unlikely that your stomach problem and indigestion
can give you dehydration
. How long are you having this problem of yours is it through out the year or seasonal mostly during warmer climates ? Have you noticed any change in your skin complexion and loss of weight inspite of healthy eating ? Do you suffer from frequent fever
? Do you suffer from thyroid diseases and other co morbid conditions like hypertension
? You did mention your CT scan done for your chest and abdomen is within normal limits so I rule out any structural abnormalities . I would narrow down my doubts on either your thyroid or your adrenal system but I am only interpreting it as per your case scenario , which is not substantial enough . My advice to you would be to consult with your primary physician and then with an endocrinologist
. Hope I have been able to help you . Take care .