I have had them in my sinuses and occasionally my ear for a while now. The only thing that stops the sinus and ear sensations for me is to treat my intestines for the invaders, then those sensations stop.
In my case it is worms. I assume these are larvae who have lost their way. After I feel the crawling sensations I find tiny perfectly formed white things in my kleenex. I don't feel them come up my airway, but I feel them come up over the crest of my sinus cavity, then the feeling abruptly stops. I have theorized that they die at this point when exposed to the air intake at my nostrils.
I would suggest parasite cleansing to see if this helps.