Do one thing at a time. If your workload seems overwhelming, don't get discouraged. Take the most important task that's haunting you and start in on it. Accomplishing even one of your 'to do's' can make you feel like you're back in control. Give yourself a break.
Some people create stress by setting standards that are too high to reach.
Don't try to be perfect - sometimes you'll have to be satisfied with 'good enough'.