<s>[INST] I was sitting down and had a weird sensation in my brain, like a pop near the top followed by a fluttering sensation that flowed down across my brain and lasting maybe 2 seconds. My tongue and lips then tingled and my head now feels numb on the inside. [/INST] HIWell come to HCMFirst of all your basic information is missing here and that is your age and gender without this it becomes difficult to think about possible causes, such symptoms may be nonspecific may be due to some anxiety and depression, still just to rule out the some central nervous system pathology CT brain can be done, hope this information helps, take care. </s>