There are astral parasites that cling to your aura or your astral body and drain your energy. This can make you unable to manifest or cause you to become unlucky. There are simple ways to do this to the more advanced and effective ways. Anything that removes negative energy works against parasites, but a targeted action towards parasites is the best for removing them specifically.
The mantra for parasite destruction is Tam Chaka Om Soha. This is channeled from the white fox and it also works for other energetic impurities or even thought processes or habits that contribute to energy parasitism. Call upon The White Fox to boost it.
Generally, phsical pain or sickness is sometimes the result of your mindset or psychological problem. There are a lot of scientific papers about how Meditation can moderatr pain and partly help in some physical issues in general.