Neptune energy produces the types of feelings and thoughts that you are having. Neptune can make you feel very strange things, and have strange thoughts. It can cause strong confusion, or even things as bad as insanity and schizophrenia. Neptune is also related to drug addictions, and bringing people to have a mindset that will make them want to consume mind altering drugs, which then makes all of the confusion even stronger.
The last full moon, or something else with another planet at that time, may have had a transit where it had an alignment with your Neptune position, which would cause the Neptune energy to suddenly become much more powerful at that time, and cause this feeling to suddenly exist for you.
You need to work with things which will make your mind more steady, and bring you closer with the truth and reality, and prevent you from going off into confused delusions. You need to work to build a steady foundation. You can do all of the Gods' rituals that are in the current schedule right now, and you can also do the ritual for Baal Zebul. These gods can give you help and guidance to fix this problem. You can also work with the Earth element to steady your mind, but be careful not to have too much because it can give you a feeling like your body is very heavy and not want to do anything.