I have a hard time trying to distinguish what is "die off" and what is a mediation side effect. Pyrantel will make me sick an hour after taking it. But i can take albenza or fenben.. feel fine and then 2-3 days later feel sick, get a headache, feel spaced out. I really have no clue anymore. I ask myself the same question every day... is there something else causing my to feel sick? The feeling that something is moving in my colon area and lungs, could it be a sudden onset of cancer or muscle spasms? I am very new to this and these experiences and its very frightening. I've been like this for a month and it already feels like eternity. I really feel horrible for you guys who've been dealing with this for months and years. Its no way to live.