Ok well im not sure if it will be too much but for zinc poisoning some symptoms are vomiting, stomach cramps, diarrhea, and nausea. Some symptoms of magnesium poisoning are Muscles will feel weak and you'll experience a general decline in strength, including slower reflexes. Feelings of drowsiness will plague someone with too much magnesium in their system. You will also have low blood pressure, shallow breathing and they may appear unaware with a lack of concentration.