Possible PPPD ?

Hello, I trained 1.5 hours a day for a week. With a lot of intensity. Monday, Tuesday, Wednesday… Thursday off. The same evening, I had a visual aura for about 25-30 minutes. I still went to train on Friday and Saturday. Saturday, after training, I had the start of the symptoms that I have had ever since. Back then, it was mostly when I was eating. A feeling of dizziness, as if I were going to roll my eyes. Without ever having it happen. Also, on a frontal elevation, I went up too high and must have hurt my neck. Sure enough, the next day or the same evening, I had pain all over my neck, and I had to put my head down to avoid it. From memory, the visual aura arrived later! It was on either side of the neck, and behind. I also saw a chiropractor, who detected a problem with a cervical vertebra and at the dorsal level. After the adjustments, it seemed to have faded nicely. But after two days, it came back, probably after continuing my bad postural habits. I am tall (1m95) and corpulent, obese (150kg). It's been 5 months. Today I feel dizzy when I stand or move around. But not sitting or lying down. I also have a BPM that goes up sharply when I stand up, it can go from +30 to +50 BPM. But it goes down immediately. Basically I'm at 85-90BPM standing. While I went up to 110-115 when getting up. It's just a peak. Exercise intolerance, sometimes. But I avoid forcing it. Treadmill aggravates. When I stand up, I feel like I have to stretch my body, and it hurts my legs. This is not always the case. And sometimes I only have the BPM problem, sometimes only the dizziness. I have no problems with balance or coordination. I can easily stand on one leg, a little less when closing my eyes. In the car when I'm driving, my gaze gets lost in space sometimes as if I were disconnected (sometimes outside the car), as if the focus was absent. My eyes are “filled” with red veins. I don't know if this is normal. The symptoms are stable, they have not really evolved. At least, it's not obvious. And if things have evolved, it’s more for the better than the bad. I saw a cardiologist. ECG, HOLTER ECG, DOPPLER ULTRASOUND normal. An ENT specialist. Normal clinical examination. Fretzel too. I made a VNG which I still have no news of, so possibly normal. I have an appointment with a neurologist in April. And I admit that I am scared by a possible neurological cause (MS, tumor, etc.) I did a brain MRI with injection and angiography, normal. For more than a month now, I have had a feeling of nausea in my throat, with difficulty swallowing. One doctor told me that the pharinx was irritated, another that I had lots of mucus. But since then, nothing has changed despite the medication. And sometimes, intermittently, feelings of very unpleasant general malaise, without ever having any. Needless to say, I didn't need to want to vomit regularly on top of everything else. I think it's related to my recently diagnosed bacterial pharyngitis. As for my hypotheses, I initially thought that it was overtraining having led to a dysfunction of the autonomic nervous system with anxiety which delays recovery and/or a problem with the neck, back, etc. But it would have improved, rather than worsened, if the more recent symptoms are linked to the old ones, which I don't know at all. The fact that it all starts right after this week hardly seems like a coincidence to me. What do you think? Thanks in advance.