Hang in there. It's all normal and can be very frustrating, but it WILL get better in a few more weeks! It's different for everyone, but if you are already trying to get back to work you sound determined and that's a good thing. Kevin finished 10/26 and went back to work on January 5th in the Artic of Alaska! It can be done, but he was very tired and weak when he went back. They let him rest each day in the afternoons. Course, they work 12.5 hour days for 21 days straight. He only worked 14 his first time back. Like you, we couldn't lose the benefits so he pushed through.
Stay strong and give yourself a break when you need it. You are not weak if you need to rest. Your body is healing from a major battle. Just know the light at the end of the tunnel is getting brighter, even when it doesn't seem like it!!
Kathy