Hi, I think i know what is happening to you and to your wife. It's not HIV but it's something else. Listen to me, it happened to me either and also to my wife. My exposure was is September 2017 and still HIV negative my last test was 360 days after the exposure. I'm still suffering from a lot of symptoms. Please, send me a private message and we will talk there.
My opinion is it is either mental, or it is indeed a coincidence. You not being able to accept the results is all in your head, you can believe having that many tests done. You do not have HIV, but you know the symptoms, looking for them so or course you will have them. You mind is very, very powerful and can make your body sick of you believe you are. The only other option is you truly have something wrong, not HIV, but you should see a Dr. to get it figured out.
It is abnormal to repeat testing as many times as you did. Your symptoms are either in your imagination from fear or are caused by something other than HIV. It is unfortunate that you have taken the unscientific approach that you don't believe in coincidence, because that mistake is the reason why you have wasted so much time fixated on a disease despite the tests proving you do not have it, all this time. See doc to determine if the symptoms are real, but the odds are very tiny that all these different issues exist.
Also quit Googling for Death cold turkey since that is just fueling your anxiety and quit over-examining your body. Without medical training and without a scientific approach is is not possible to diagnose disease, so your confidence in your ability to diagnose HIV or any other disease is unrealistic. Everyone posts here about their white tongue, but my guess is it was always that color but you never studied it before.