Don't be desperate, it still is relatively easy to fix. You're not too far gone, it is only a matter of time if you take proper actions.
First, before thinking antiparasitic herbs, rethink your diet. What is it like? You need the best diet to put back into balance your gut flora. There many different diets, but it seems that the most important rule is to limit animal protein, especially red meat, to restrict grains especially refined ones, to eat plenty of raw vegetables, and to practice food combining. If you can afford the cost, the time and the detox symptoms, go on a vegetable juice fast. It is still the quickest way out of your misery.
To rebalance your gut flora besides diet, there's several many helpful items. Antifungal and antiparasitic herbs such as garlic, turmeric and the like are great, I've used them with success but they can also affect beneficial gut flora, so I suggest you start drinking homemade kefir and see how you react to this. Work your way up to 1
quart a day. It is pretty powerful stuff against pathogens and won't affect the beneficial bacteria, on the contrary.
While you attack pathogens, you will feel worse because of the toxins they release when they die. AT this time, you want to avoid constipation at all costs and should have at least two bowel movements a day. If not, use psyllium, ground flaxseeds and even stimulant laxatives like senna. Enemas are great too.
During this phase, you wanna take care of your liver and kidneys. Coffee enemas, milk thistle or beet juice for liver, herbal teas (parsley, dandelion,...) and plenty of liquids (pure water, lemon juice...) for kidneys.
Other beneficial stuff are for example betaine HCL with protein meals and enzymes taken outside meals. If you can afford expensive supplements like colostrum or chlorella, they're great too.