Detox methods promising weight loss are usually iffy in the extreme. Eat a generally healthy diet, and if you want to try losing weight, go for one of the trusted methods such as calorie counting. Our bodies are under enough strain with ME without adding drastic measures which would probably just make us more ill. From what I remember of what you're handling at the moment, it sounds like you may have enough on your plate right now without trying to lose weight as well. Perhaps save it for a time when things are more settled?
As for cheap, buying colon cleansing remedies is not cheap because it costs money! Calorie counting using free dieting software is not just cheap, it's free. I've lost a quarter of my body weight and am finally back to the weight I was at during my early twenties without spending a penny on cleanses or detox whatsits. But as I said, it may not be the best time for you to undergo anything dramatic. Maybe try tracking what you eat for a week, and then noting down any patterns to see if there's anything it would be relatively easy to address? Eating at more regular hours is usually good for us ME folks (that plus being aware of what I ate were the main things for me - I'd totally lost track), and skipping the junk is often wise as well. A friend of mine who also has ME has lost about 55lb by cutting out cakes, chocolates and sweets. She's too ill to cook and doesn't have support in the home, so she's simply buying lots of frozen ready meals. Yes, they're processed, but they're a lot better than what some of us end up eating, and they're calorie-controlled which makes it simple for her to manage. It's not been easy, deliberate weight loss is never easy, but it has been relatively simple for her.
I've been thinking that it would be good to have a thread for those of us who are deliberately engaging in weight loss, incidentally.