I have some advice: Smoke your weed slower. If you chain smoke it until you start to feel high, theres a good chance you've smoked A LOT and you may have gone overboard.

The high you described (where you're kinda semi aware of whats going on, and are surprised to find yourself in certain places) is something I've experienced and actually enjoy. Try to just chill and go with it. If it's too much then just put on some music and lie down on your bed, or watch a movie. If you're really concerned about it, call a friend, lol, but not your mom. I would NEVER tell my mom that I smoke weed, because then she would kill me.

You don't generally need to worry about anything unless you have a headache or feel naseous(as if you're going to vomit). My inclination when this kind of thing happens is to go to bed, but that could be dangerous, I suppose. Oh well. Phoning a friend would be a good idea, preferably someone who has more experience with reefer than you.

EDIT- One time I though I had laced weed, but it turned out my stuff had just gone slightly moldy. Peace!