stay with the protease, or you can also try pancreatin, bromelain, papain, and other plant based enzymes.
DE works as advertised, mechanically killing off the larger parasites. It may agree with you or not, but as far as I know there is no specific contraindication for DE with AF aside from the parasite die-off.
I think you should consider underlying reasons for your parasitic 'infections'
There is the Klinghardt philosophy that most of the helminths are sequalae of underlying metal poisoning.
Raw foodists will tell you that parasite 'infection' is a sequalae of having a very toxic gut, and the worms are there to do the clean-up.
I took DE for a stretch a long time ago and the die-off was a nightmare, but at least I know that it works.
For larger worms, one of the standard ayurvedic herbs is vidanga (sic?). It tastes literally like dirt,
I posted this a few times in the past, but one of the best things I found for the larger worms was fresh made, sweet pineapple juice. First, if you have any craving, indulge in some junk food like cookies, ice cream, whatever your worms most desire, then follow it up 20 minutes later with a pint of fresh pineapple juice. I got rid of tons of Ascaris like this, and for some reason it was the least painful way to do it out of scores of things I tried.
Pineapple juice is also a recommended food for blood type O.
Cloves have action against strep infections, and this is another recommended food for blood type O.
MSM (sulfur) has specific action against giardia, preventing them from attaching to the mucosa, maybe it works similarly to the way lectins work. So in theory there should be no die-off as you aren't technically killing anything, just preventing it from attaching to you.
Kelp and Fucus, for blood type O, work as a lectin blocker for h. pylori, binding to it but not killing it.
So if you are blood type O, here are some simple food choices that can eliminate most of your stated infections.
Chamomile is known to be a general soporific, but I learned last year that it can put some parasites to sleep, so that could be a good one to try as well.
There was a post about raw cocoa killing parasites somewhere, and this may be a very clever way to kill them too, as cocoa is toxic to many smaller life forms like dogs and cats, and perhaps it is lethal to worms.