You should do the parasite cleanse for at least a month, as some parasites lay eggs which might take a few weeks until they are totally eradicated. if you can't tolerate taking the wormwood/black walnut/cloves for a month or more, then you could try taking black walnut green hull extract and clove oil, or just clove oil if you can't tolerate the black walnut for so long. Clove oil is said to be active against many parasites and parasite eggs. If you do have parasites, you might not see any, as most parasites are microscopic, or very difficult to notice.

you are taking this just 2 hours between doses? it is supposed to be taken just 2-3 times a day. If you take it too frequently, it is likely enough that you will get diarrhea again.