Thanks for writing in,
Seems you are suffering from spasm of abdominal muscles due to heavy work load. Nothing to worry as rest and few medications will improve the condition.
You are advised not to strain or do any stressful activities like lifting things or bending your back etc., A course of muscle relaxant
along with pain killers will help you a lot. Hot packs at the painful site will reduce your pain too. Rest and relaxation to spastic muscles
is very important.
Discuss with your doctor and get clinically examined if the pain progresses or associated with any other symptoms like vomiting
Get well soon.