I've been taking a high dosage of magnesium for over a year and would like some feedback on how long such a high dosage is necessary. I suffer from frequent constipation, migraine (greatly reduced frequency now) and occasional foot cramps. Under stress, constipation becomes a fixture (when I was in hospital for 12 days I didn't go once), and migraine frequency and severity increases. My daily magnesium intake: 600mg Doctor's Best Chelated Lysine Glycinate magnesium spread over three mealtimes plus 200g magnesium in the form of Epsom Salts footbath in the evening. In stress situations, I occasionally add magnesium spray in the early morning -- up to a 200-300g equivalent. I also take 1 vitamin D3 tablet a day (14,000 IE).
My questions:
1. Can I expect the constipation and migraine to disappear

2. Is it recommended to continue with this dosage for so long?
Thank you so much for your help!!
Helen