Hi
Welcome to the MedHelp forum!
Magnesium can be the cause of anxiety and tremors. However, they can also be due to drugs, alcohol, smoking, lack of sleep, poor sleep patterns, stress and fatigue. They can be seen in peripheral neuropathies of diabetes, in hyperthyroidism, parasomnia, multiple sclerosis, TIAs or transient ischemic attacks or mini strokes, hypoglycemia, disorders of calcium metabolism, hyperparathyroidism etc. Certain epilepsies too could be the cause. Consult an internal medicine specialist or your PCP. Discuss these possibilities with your doctor. A comprehensive investigation is required keeping all the points in mind. You will need blood sugar monitoring, MRI of brain and cervical spine, T3, T4, TSH, sleep studies, serum electrolytes, brain EEG, etc to reach a diagnosis.
Take care!