Pushed to the limit!

My husband worked so hard installing our pool. Of course with all the FMS pain, I was no help at all. He was napping today, so I decided to help out by leveling out some dirt piles with a rake. W/in 5 mins., my upper arms hurt so bad. I continued to do this at 5 min at a time resting a little in between. Now my shoulders and upper back and arms are hurting so badly. That's the way it happens. If I do anything, I pay for it later. I'm so sick of that!!!!!!