I read many posts like this several months ago, when I began to have the same crawling sensations. I first noticed them at night when I would go to sleep. The sensations occurred only in the right ear, at first. At the time, I was under a lot of stress at work. I thought it was due to the lack of sleep I was getting...3-4 hours a night. I even attributed it to the stress.
I was diagnosed several years ago with Meniers Disease, and have had issues off and on for years...but this was completely different! My GP sent me to an ENT who saw nothing, and offered no solutions...I left discouraged, but knew I was not crazy!
The good news....my GP had the thought of checking my Vitamin B levels...this is the vitamin tied to your nerve pathways. She had a neurologist to tell her once, that when addressing any neurological problem...she first checks the Vitamin B level.
Let me say, in the past, I was careful to take Vitamins during my pregnancies, but that is it. I am now a believer! I began taking a daily multi vitamin with a daily dose of B complex and saw significant improvement! She checked my levels a month later and found that I was in the low normal range, and added Vitamin B sublingual to the regimen...guess what...after several months of those terrible sensations...they are GONE! I would have paid anything to make them go away, but was thrilled that everything was over the counter and available at any local drugstore!! Good luck! I hope this helps!