When you go to a doctor and you are not sure about your problem, you first go to a General Practitioner. A General Practitioner is a type of doctor who can help you decide what type of SPECIALIST to see.
I've had Dengue Fever from a deployment to Haiti years ago. Although you describe a couple of the symptoms, you didn't include the major symptoms that people with Dengue usually experience. Having said that... I'm no doctor but I can tell you that I had comrades that contracted Malaria and their symptoms are/were related to those that you have described. Get to a REAL doctor soon... Good Luck!
He needs lab blood tests. These symptoms are not very specific, unfortunately. A general practitioner or doctor of internal medicine would be good.
Thank you guys for the help. This past weekend, we were able to see a specialist and an endoscopy was done. We are awaiting the pathology report. Now, we have a clear idea as to what the problem might be.