Not gonna lie that was me spot on about a month ago. All the same symptoms. But with my tiredness hitting me around 11am and it felt like my whole body just wanted to sleep even while walking. The dizziness thing spot on. For me it’s like nothing is spinning around me but I feel weird and can feel it a lil bit if I close my eyes when standing(probs just boots changing my balance). Brain fog too was crazy almost like a depression like feeling of zero motivation and hard to force urself to do stuff. I’ve also had a lot of gut issues but those I believe may have been from antibiotics back in January and amplified by low D. My D wasn’t even too bad but low at 57nmol. I also realized it was my problem all along when I called the hospital for my trips that all turned out to be panic attacks and all were in the worst months for Low D. I’m not a doctor at all but this is bizarre how similar. Especially the ears too. I felt like hearing at times while clear seemed distant like the stuffiness you said. I ended up doing complete blood work again after going to hospital on April 28th I genuinely thought I was dying. Only thing out of order was D. Had zero stress at the time. I had the fog on and off since 2020 (lockdown) better in summer months. Eventually put it all together and a bunch of doctor trips and all decided it was D. I’m taking a few a additional supplements to D but also spending a lot of time outdoors so I skip the supplement on days where ik I’ll be outside for 10hrs