Some of those yellowish pix look like flukes of some type?
Have you tried Diatomaceous Earth? If not get some from Permaguard online, to start with. One TBLS in juice or soft food like applesauce twice a day should help, this works mechanically. It's reasonably priced too.
Start off with 2000mg of vitamin C, and work your way up from there, as long as you don't have any side effects. It's beneficial for the immune system!
Two tablespoons of coconut oil, followed by a good laxative such as Epsom Salts , should help get some of them out.
I don't know what else you've tried previously, so I can't advise further.