I felt a bug on my left side neck. There
Delusional sensations to consider.
Hello and welcome to "Ask a Doctor" service.
I have read your query and here is my advice.
In my opinion, a form of delusional parasitosis, or formication, should be considered in your case.
It is a symptom that may be related to underlying conditions such as peripheral neuropathy, medications adverse effects, shingles, etc.
So, an evaluation by your Neurologist is necessary to get a more correct understanding of your condition.
Treatment depends on the cause. For example, correct treatment of peripheral neuropathy and its cause should improve these delusional sensations too.
Hope you found the answer helpful.
Let me know if I can assist you further.