I Think Magnesium Glycinate Is Causing Me Severe Nausea

As I long covid sufferer I read many stories about success with magnesium glycinate. So I took the plunge and ordered a very clean product from Polarbrite (650mg). Started on the 10th Dec 2024 and the first two weeks I felt great, really noticed a massive difference in my brain fog. Then about a week ago I started feeling so nauseous all the time, to the point last night I was literally focusing on not vomiting, along with hot flushes and muscle weakness, which I read that are side effects. I think it is the magnesium, as that is the only thing I have changed recently. So I'm done and stopped. Still feel slightly nauseous today, hoping it will pass soon. I feel like a right dummy!!

Can I ask if anyone else had this before from trying new supplements?