Hey, I've never heard of any type of reaction from taking coconut oil other than allergies but then again I've never actually looked in to it. Why do you take oregano oil? That is a antibiotic, and I've read conflicting information about whether or not it should even be taken internally, I personally would not, I would think that it would mess with gut flora.
What I would do about your head and joint aches and being sick is take lots of ginger. Ginger is anti-inflammatory, can help reduce pain and inflammation throughout the body, and can help keep you from getting sick. Here is some info, http://www.keeperofthehome.org/2010/02/a-year-of-herbs-ginger.html although I think there are some things she doesnt quite cover sufficiently. Anyway, how we take it- Grate a tsp or 2, pour nearly boiling water over it, steep about 15 min, and we drink it all but some people strain out the ginger shavings. You can also cut out a chunk of ginger the size of a large pill, poke holes in it, and swallow it like a pill. I always roll my chunk of ginger in powdered turmeric first then swallow, it does seem to help even more with pain relief or symptom relief when we are sick. You can do the same thing with a garlic clove for sickness as well.
Do you read Mercola? Subscribe to the newsletter at www.mercola.com I think that will help you with your overall health! He sends out daily newsletters with 1 or 2 new articles, very good info!