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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
Thanks for trusting me to help you and Tiesto today. I am a licensed veterinarian with over 30 years of experience and would be happy work with you.
It sounds as if he has had quite a workup already. With the type of symptoms that you are describing, I think it is very likely you will not be able to get to a diagnosis or possibly help him without the information gathered with an endoscopic exam and biopsies of the upper GI tract. His severe weight loss is very concerning and there may be significant disease present, but the GI tract is difficult to visualize, even with advanced imaging such as ultrasound. The only way to get an accurate picture is with a scope. I understand it is costly, but perhaps there are ways to get help in paying for it. Here are some links that may be helpful.
Care credit (veterinary): http://www.carecredit.com/vetmed/
Financial aid for vet care:
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.