I totally understand what you're feeling. It's really frustrating - I'd take the mania over the depression any day of the week when it comes to work. Have you talked to someone in your health and safety department at work? They have to make accommodations for people with disabilities by law. Or, maybe try talking to your boss. I was afraid initially of letting others know about my mental condition, but I talked to my boss about it at my previous job and it resulted in them agreeing to hire an additional person to take off some of my workload.