Velha, I also had the weight loss thing, for over a year, whatever I ate I would still lose weight. Pretty sure I wasn't absorbing food, whether due to leaky gut or other digestive issues I don't know.
About 3 or 3 1/2 months into Freddd's active b12 protocol, my nausea level and frequency dropped noticeably, and it started feeling as if I were digesting my food and getting the value out of it more. RichvanK has posted elsewhere about the link between methylation and the digestive system.
This is not to say parasites couldn't be a problem here, just that there are many possibilities.
Dan, sorry in my brain fog I seem to have thought this was Dreambirdie's original question. I still think it might be worth going to a parasitologist who wasn't trained in this country. My friends with confirmed parasites have gotten very little joy out of AMA doctors from this country, though there may be some good ones out there who really know what they're doing. Don't know if walnut hulls are too drastic for you at this point but they do seem to be considered effective.
I've been on Freddd's full protocol since mid September. It has done wonderful things for my energy and brain fog and other neurological symptoms. Unfortunately, it hasn't taken care of my digestive issues. Thanks to the protocol I can tolerate a lot of things I might not have been able to - I had MCS 'like' symptoms prior to starting and those seem to have resolved.
Thanks for starting this thread. I'm interested to learn what has worked for others and try somethings myself.