Anastrozole

Hullo all, finally got through the radiotherapy (25 blitzes) which wasn't too bad until the last week and then skin broke, horribly painful, last two treatments even the nurses could see I was in agony, the Cancer Clinic gave me some clear gel, like Solugel, to be covered with jellied gauze squares and sterile dressing pads, apparently I was only meant to change them once a day but I did it at least three times a day just to get some relief from the open burns areas. Went back to the clinic, turned out I should have been using systematic pain management, not just taking an occasional Panadol. Well, all that's another story. So as soon as the burns were healed I started on the letrozole - Femara, not the generic, don't really know if it makes a difference but a lot of the UK forums seem to think it does. It is over a week now and apart from a few transient flushy feelings I am doing OK with it. Blood tests at GP show too low in Vitamin D so now about to start supplementing that. Am taking one-two Caltrate tablets per day and one Krill Oil capsule. But I see many recommendations for magnesium and have found that there are all kinds of magnesium supplements, powders, tablets, rubbing medicine.Can anyone advise?