How about laying off the oregano oil for a couple of weeks and cleansing with food grade diatomaceous earth? The vitamin C and oregano oil cleanse and heal but if your liver is stopped up with toxins, your body/liver can't eliminate the die off.

Diatomaceous earth will help heal and support your liver. It will cleanse the liver and eliminate the die off effects via your bowels. It will also scrub your colon, eliminate any parasites and worms, and might eliminate the Lyme disease as well.

If you have yeast left, the DE will help eliminate it via the production and elimination of mucous which can be from your bowels, throat, and nose.

You can continue with a smaller dose of vitamin C for additional healing.

Since your problems are so long standing you might want to take short 2 week breaks between 3 week treatment cycles.

It's natural for effects of your infection/infestation to get worse as your body heals and eliminates toxins/parasites. The body learns to tolerate and live with long standing poisons even though they can be debilitating. The effects of such become more severe as the body throws the poisons off. Sort of the opposite of certain medicines...a little can help, a lot can kill.

This is because the body has built dams around the poisons/parasites as much as it can to contain them and protect the body but in order to be treated the cleansers have to breach those dams to get to the toxins/parasites which results in both die off and leakage of the t/p into circulation.

And that's why treatment has to take so long and why there are periods where you feel better and periods where you feel worse.

I hope this helped.