Wow, you are not drinking due to MD swallowing issues? I'm sorry to hear that. What your doctor said does not sound right. I would not think fluid retention would alter hydration test. That accumulation of fluid you are retaining is a symptom in itself that should be evaluated. I would get a second opinion. Do you have headache? Nausea? Severe hydration can cause a host of symptoms including those and rapid heart rate. If you have no urine output, you need to see a doctor. Especially with your complicated medical history. good luck and please let us know how you are doing.