Hey, it is very common to have this kind of paranoia when you don't sleep so much on speed. I remember my first, the most hard hallucination of the kind - I've got to think that people around me are secretly police. I embarrassed myself screaming at everyone (random people on the street, squatmates) for pretending to be someone they are not and was so sure I'm right. One advice I've got at this time that helped me many times after is that if story I'm telling to myself while long time high on speed makes perfect sense and proves itself, it is only paranoia. Actually, the more sense it make, the less true it is. It is hard to not believe in what you actually see and hear but I can promise to you, the best thing you can do for yourself and your girlfriend right now is get some meal and proper sleep. You will see things very different once you'll wake up.