Hello,welcome to HCM,
Have you tried;
1. Keeping toes bandaged together with crepe bandage while you work.
pills to improve healing and reduce swelling
3. Your work description is stressful for feet ,use good support shoes in addition to above.
4. If all else has been done and you are in constant pain,suggests a hairline fracture
a. X-ray foot to see for a fracture
b. a visit to a bone and joint specialist is due.
Hope you get relief earliest .happy to help.