First, STRONG craving

This might sound crazy. I have never had a craving before. im not sure. I never had a craving before. like I've wanted something but not like needed at the moment and will go out at anytime to get it. also I've been experiencing headache, indigestion, nausea, dizziness, and sleepless night but super tired days.

Yesterday I had a strong craving for sushi. Then I had an even stronger craving for something sweet and warm that I even had to beg my bf to drive me to get something bc if not I would have walked. And today I craved mac and cheese and went out to buy some.

Is this happening because of something else? Or is this normal ? Do cravings happen out of the blue like that? Feel free to ask follow up questions if I wasn't clear enough. I'm curious as to what is going on.