Last half of year whenever I start to experience:
extreme fatigue- to the point when I'm unable to function and fall back asleep few hours after waking up if slept less than 8 hours, stinging/itching feeling all over the body, extreme heat intolerance, headaches that don't go away by any means, problems with pooping etc.
I start to take phosphalugel 2-3 times a day after a meal and it makes me feel better in day/two. Then after some time I stop and cycle repeats again after some time. It doesn't work if phosphalugel taken at any other time- strictly after food ( sometimes I might walk for a couple minutes inbetween meal and phosphalug. ) Few days in I usually replace one dose with oatmeal hour before the bed.
I also take 2 proton-pump-inhibitors per day all the time. If things get bad migh up it to 4. At this time I also try to avoid any foods that irritate gut.
I have many issues that come and go regardless of above, but this outstanding weakness is always gets stopped by short phosphalugel course.