The DE is making you constipated because it is very absorbent (drying). Industrial purposes for it include absorbent agent to make dynamite.
DE made my parasite infection go systemic (worms leaked out from the GI tract into the bloodstream). This is done because DE is very abrasive and drying. Another industrial use for it is METAL POLISHING.
Also, DE didn't do anything to kill the worms. Try garlic or pau d' arco if you want to go natural, and Rx drugs like albendazole if your infection is more severe.