Entirely separately, at another time, while taking other antibiotics, I also got a very bad yeast infection
, but it was intestinal and not vaginal. I got abdominal bloating, stabbing pains at the waist, fog brain, and gained a bunch of weight. It took almost 6 months for the MDs to figure out it was a systemic yeast infection -- I guess they don't see many of them. So that's probably not your issue, but thought I'd mention it since your symptoms sound similar to mine.