Can depression cause you to feel this way? Or do you think something's wrong with me?

feeling forgetful and fumbling with your speech can go along with low thyroid. you would probably have some other signs too like weight gain, tiredness, constipation etc. also, if you have been through something dramatic it could be ptsd (post tramatic stress disorder). i think stress and anxiety could be part of it as well, but it does sound like there is more to it than just that.