Sounds like Lyme Disease. Overseas they know it better as Borelliosis. I have had many of the same symptoms that you are describing, and no, you're not crazy or a hypochondriac. You're very ill.
I've heard other Lyme patients in TN say they have had a hard time finding a doctor who knows how to diagnose and treat Lyme. You might need to check out your local Lyme support group to see what recommendations they can make about a doctor for you. You'll need a Lyme Literate Medical Doctor (LLMD). Pay cash if you have to. Your life is worth it! Many LLMDs have a substantial wait to get in for a consultation. The sooner you find one, the better. While you're waiting, you can get tested as that takes about a week.
If you acquired it overseas, you might have a different variation of Borellia than what we have here, which means you could be more likely to test negative according to the CDC criteria. Unfortunately, our medical establishment seems to believe that our tests are completely accurate, which they are not. I believe I got Borellia overseas, and I tested negative at a military hospital, but positive at IGeneX (they use two strains in the test instead of only 1). I probably have b.garinii, whereas in the U.S., we only have b.burgorferi.) The one shot of Rocephin you got probably made a dent in the initial infection, but not enough to kill it all.
If an Infectious Disease doctor diagnoses you with Lyme, s/he will likely tell you that you can be cured with 2-4 weeks (or maybe even 6!) of IV antibiotics, but in reality, you'll need a lot more than that. Don't risk being sick forever with the so-called "Post Lyme Disease Treatment Syndrome".
You can learn more about Lyme at www.ILADS.org
Here is a document that was very useful for me. It has a thorough symptom list.
Oops, I misspelled the bacteria name. In Europe, they have Borrelia Garinii, Borrelia Afzelii, and less commonly, Borrelia Burgdorferi. Here in the U.S., so far, we only have Borrelia Burgdorferi. In Eastern Europe and Asia, they also have Borrelia Valaisiana. It is recently emerging in Australia where the government is still pretending it doesn't exist despite numerous patients who are sick and testing positive who have never left the country. As they haven't confirmed the disease in local ticks, nobody knows which version they have. I'm confident I got it in Queensland, Australia, and my symptoms are very consistent with most Borrelia Garinii symptoms described in Western Europe.