There are a number of BP members who work in the medical field. I'm not one of them and I hope you hear from them with solid advice. Here's the best I can offer:
Have various lab tests and imaging been done? Has your husband seen his primary doctor for input when not in-hospital.? Has he contacted his medical plan for referral and/or advocacy? It may be that he needs to see someone in a specialty other than surgery, e.g., gastroenterology.
Unless you live in a small town near Nowhere [will you name your town and state?], I don't see why the surgeon would have said there is no one else, certainly since he also says he has "no idea,,," The response is unacceptable given that the problems persist. As a non-medical person, I know that fever likely indicates infection. Getting a second opinion certainly would be wise and within your husband's right.
If you want to find a medical advocate to lighten the load for you, try googling "find a medical advocate." Several things come up, including info at AARP's site, Oprah.com, Consumer Reports. I can't speak for their usefulness, but they are there to be explored if you wish.
The reason he said he is the only one is because he is the only bariatric surgeon in this hospital. But, there are 3 other bariatric surgeons in the same city who do the sleeve but he won't call them. He wants to stay in his own network. He said we can get a second opinion but the nurses told us that us just calling another surgeon's office will get us no where. We need HIM to make the referral.
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