I get like that often. I've tried to pinpoint what's going on, but by far the best way for me to avoid it is to be mindful of my fluid and food intake. My parents laugh about my stomach telling me it's time for lunch or an afternoon cuppa. But, if I go over the reasonable time period, I start to get moody or feel like I'm in a dream. If I'm still looking for somewhere to get food, while I'm in that state, I start to feel panicky. Maybe I have blood sugar problems (type 2 diabetes runs in my family, among slim folk). I really should get it checked out. I also have cyclical depression (which is becoming more and more obvious to me) and can be 'high' for no reason too. How I react to comedy shows is a tell-tale sign that something is out of whack. I doubt I'm bipolar, as I don't lose touch with reality. It's nothing like the bipolar episodes my auntie had. BTW She had type 2 diabetes and she was skinny.
_________________
"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley