I go to crossfit everyday of the week except on sunday (because there is no class on sunday). I weigh 220 lbs and considered over weight, so I struggle a lot to complete the workout. I am not sure, if resting couple of days would help. I tried resting this week by not going yesterday and today, but I feel more tired than days I workout. what should I do?
You would be much better off lifting three days a week (full body workouts using compound lifts) and walking (perhaps briskly) for one or two other days of the week. If weight loss is your goal I would also suggest looking at your diet.
From what you're describing with you and CrossFit it sounds like your body cannot recover from what you are doing there.