Common Magnesium Deficiency Symptoms in Strength Athletes

I am starting to suspect that I might be deficient in magnesium despite having a decent diet. I am looking for a list of common magnesium deficiency symptoms in strength athletes. I have been dealing with muscle twitches, poor sleep, and a bit of heart palpitations after my heavy deadlift sessions.

I am in the US and I train very intensely which I know can deplete mineral levels. I want to know if these symptoms are a clear sign that I need to start supplementing or if it could be something else. I am also curious about the best blood test to check for magnesium levels.

Have any of you dealt with a deficiency? I would love to hear how you corrected it and how long it took before you started feeling better. I am specifically interested in how it affected your strength and your overall recovery quality!