Can anyone advice me on what could be wrong despite tests showing nothing?

Possible thrush, generalized fungal infection that mimics panic attacks, eat no sugar or carbs, this should help until you get diagnosis. That means only meat, eggs, fish. nothing else, this not only works for panic attacks, it also works for the systemic yeast infection, the fuzzy tongue is the reason i suggested the fungal infection, thrush. - look online for systemic yeast infection for more details.a href="http://www.stopyeast.com/candida-symptoms.html" rel="nofollow"http://www.stopyeast.com/candida-symptom…/a