They could be, but it sounds like your entire digestive and immune system has been compromised to the point where you need to go whole hog into a total-body cleanse. Switch to a candida-diet and read up on cleansing the colon, liver and kidneys. There's plenty of info here, and I also like to recommend these sites:
And the guide to colon health by Dr. Jensen is excellent.
You also need to do the watercure and take up some kind of exercise, preferably a combination of yoga and walking and bouncing on a trampoline, and board exercises for strengthening the colon and abs.
DO NOT start taking a ton of vitamins and other supplements unless they're for cleansing and probiotics. There's no point in stressing the liver even more. You need to get clean, the vitamins won't help with that. Some herbs will, all listed on the above pages.
Ayurvedic medicine is very clear about what it means to have a coated tongue, how bad that is for your entire system. If your tongue is coated, so is your entire alimentary canal, so you're no longer able to absorb anything healthy or digest anything properly. You have to get rid of the crud.
Also read the "Eat right for your diet" book for clues as to what got you to this place to begin with, and how to avoid it in the future.
HOpe that helps!
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