Yes, it's very normal for emotional stress to drain the body.
You've been operating in crisis mode for several weeks now... with the sudden change in residence and all the In-Law drama and stress.
You're body was probably running on pure adrenaline. Now that things are reverting to a more "normal" state, your body is saying... 'OK DH, time to decompress, refocus, refuel and recharge"
You can't do that without taking some down time.
I think you should give yourself a break and put off an of the 1000 little things that aren't 100 percent necessary... and just give your body and mind time to recharge.