It's just stress and a reflection of you overthinking it all.You'll be fine.
Your brain is a funny thing, and dreams are influenced quite a bit by little things. Your subconscious part of your brain often picks up on little unseen details that the actively aware part does not, and so dreams are often confusing to us because we see shit that we don't recognize. Stuff that doesn't make sense.But in fact, it's just the little details your subconscious picks up and hangs on to. Your dreams are split into pieces. One half is the digesting of things the active part of your head picked up, and the other half are the unseen things you're not actively aware of, but still leave a footprint on your mind.I wouldn't worry about it. What you should be worried about, is the here and now. So calm yourself down, and try to relax!