Why Does My Face Tingle And Thinking Become Difficult When I Eat?

Hello. For a week now when I eat my face tingles and I get a bit confused, hard to think. My blood sugar has been low normal. THis all begane after I began takeing a perscribed med for IBS follwing a colonoscope. I stoped the med on the 5 th day when this hit and have not taken it since. I thought it may be the med but then happned again while eating fruit. Since then it hapnes withanyhting I eat. I did changemy diet and lost a bit of weight, from 157 to 147lbs. Nl BP, .....