Im sorry to hear about your symptoms. Now from what you are describing it is possible that you could have developed autonomic neuropathy. this is a condition in which the autonomic nervous system has been damaged because of a number of underlying conditions e.g diabetes however in some cases the underlying cannot be determined. The hot and clammy feeling after eating could be a sign of this condition as well as dizziness and lightheadedness. This would worsen when you stand up from a sitting position. In autonomic neuropathy there can be a marked drop in BP on changing postures. Now as i said the causes can be numerous, this could be due to amyloidosis which is an abnormal protein which is deposited in various organs of the body, autoimmune diseases can be a cause as well which should be considered. The treatment for autonomic neuropathy usually involves treating the underlying cause and in some cases drugs like midodrine can be used.
the possibility of other GI disorders cannot be ruled out at the moment however if the MRI of the pancreas and liver as well as the gallbladder are normal then they can be ruled out to begin with.
As you are planning to see an endocrinologist, it would be wise to get tested for thyroid disorders as well. Hyperthyroidism can lead to symptoms like these alongwith other hormonal disorders.
In short i think you may benefit from a workup for autonomic neuropathy as well as looking into the thyroid as a cause for this problem. Ill be happy to answer any more questions which you might have
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