Tatyana and everyone, thanks for your tips on magnesium. Finally got round to buying some after being C for 4 days last week (succumbed to laxatives in the end, ergh) and onto day 5 again this week, last night I took 3 caps of Magnesium (desperate!) and this morning - happy days!!! I'm stoked. My mood has totally lifted. I've been obsessing over this to the point of misery.
Going to see a naturopath on Saturday to get some more ideas for nutrition since the constant strategising is surely contributing to worsening C...