Try using a lot less. Just take one puff or just have a small bite of a brownie. Also, make sure you are using nice nugs (not mids or schwag) and make sure you are in a happy setting/mood. Don't over-think it. If you are really worried about this, check and make sure there isn't a history of mental illness in your family. Most likely, you are probably fine and have just been smoking too much for being new and having a low tolerance.