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Hello from JustAnswer.
Since you are having difficulty discerning the difference between reality and dreaming, the first step in determining whether there are any parasites would be to see your primary care physician. If the evaluation by your primary care physician does not demonstrate any parasites, then that would indicate that the perception of parasites would be a delusion. In that case, it would be appropriate to be seen by a Psychiatrist, who can consider the prescription of various medicines that can help ease the delusions.
If I can provide any clarification, please let me know.