Yes, I'm sure the HM's have a lot to do with it. Much of what you describe are detox symptoms.
Sorry I don't have an answer about liposomal C but hopefully someone else will know (although I have heard good things about it). I can say that I had to titrate up on vit c very slowly cause of digestive problems. I remember one case where a woman had to work up to 9,000mg vit c in order to help symporter defect while for another person only 3 or 4,000mg were needed. We're all different.