IT was just a dream. Scorpions in your stomach? You went to bed hungry right? Well, there you go. Pizza, in it too, further proves your stomach was pissed off at you for going to bed hungry.
You say your dreams usually come true. But you do realize that if you are in tune with your GF/wife/significant other, you probably know what is going through their head if there is a major decision coming up and so it can influence your dreams, having a "deja vu" moment.
If your dream of scorpions comes true and they really are in your stomach/gi tract... you got bigger issues than trying to interpret a dream.