One thing about Candidase (link #1) is that it contains two enzymes (protease and cellulase) to help break down the yeasts' cellular walls. This can be helpful, but keep in mind that this isn't a comprehensive "yeast killer" product by any means, but is equivalent to a rifle's being just one form of weapon in an army's overall arsenal. Taking other products at the same time, such as Twinlab's "Yeast Fighter" (link #2) or others found at link #3 would provide an effective variety of yeast-killing herbs as well. Interestingly, a dose of "Yeast Fighter" also contains 3 grams (equivalent to about a tablespoon) of fibers (psyllium, guar gum, and pectin), which may also help your constipation.
"...b-complex, centrum..." Keep in mind that common brand names including Centrum are NOT high-potency supplements. I'd skip the B complex and just take a single high-potency supplement, plus a separate Vit C pill. There's a billion brands out there, and they don't have to be expensive to be good. Two examples are Target's "Women's Health" and "Men's Health" brands of multi-vits/mins.
Candida treatment also taxes the liver, and you mention "extreme brain fog." This is caused by candida-related toxins getting past a "leaky gut" into the bloodstream. See link #4 for typical liver support formulas. Your gut beneficial bacteria are likely altered, as with most candida folk, so probitics such as in link #5 should also be taken. To repair the leaky gut and fight toxins, respectively, the amino acids glutamine and cysteine should be taken as well, although large servings of high-protein foods (meats, nuts, seeds, protein shakes) readily contain enough of both to suffice.
"I feel like I am going to explode and am scared that there are worms blocking the colon and as a result toxic material is circulating back into my system." Relax...and calm yourself. If you had an actual helminth (worm) problem, you'd likely have noticed specific, related symptoms by now or even have seen a worm itself! What you've described -- brain fog, drunk feelings -- suggest an overgrowth of gut yeast. Like anyone else with gut ailments, you may also have "worms"...but I'd bet $20 you don't, just as most other people don't. If you really want to get to the bottom of it all through a proper diagnosis, have a comprehensive stool analysis performed for $300 (or covered by insurance), link #6. Best wishes...and relax!