Truth?

Descarte speaks about the deception through perception. He doubts his senses are telling him the truth. often times in dreams people wake to reality wondering if these happens really happen or were they imagined. the question of reality comes into play through our reality of knowing the possibility of things happening.
I personally like Decartes' theory because it explains why sometimes we might question how real are the events that occurred in our dreams. The activities, themselves, are possibilities of things that can be true, and maybe the person had fashioned that image in their mind at an earlier time. At this point the image earlier thought about has come back and it is now placed in a scene in one's dream which makes all the surrounding seem to be as real as other events. With that said Descarte had a point in saying your senses can deceive you. If one's dream was to display trauma and his/her sense of touch, taste and smell are lead him/her to think this is real, why should that person not in return question (when he/she believe he/she has woken up) am I still in a dream or is this reality?
The thought of going through each day trying to figure out are the events taking place part of what I've been calling reality or not seems to be quite nerve racking. Furthermore, if one cannot trust his'/her reality, what is to be considered true about things? Are people to just doubt everything and believe nothing?