Odor in Kitchen?

There is an odor in the kitchen that smell like something stuck under vacuum belt is burning. The odor is not constant, but seems to come out about every 40 minutes to and hour and a half. This is constant every day and is getting worse and leaves a bad taste in my mouth and makes my eyes burn. I have turned breakers off for each appliance one at a time to see if it was one of them, but the odor is still there.

I had an electrician come over and test and check all outlets. All was good. He could not smell anything, but both my daughters and my son can smell the odor. What could this be or who could i contact to help and advise me?

By Teresa