Hi, thanks for your query.
It seems that you and your mother have acquired scabies
caused by mites.
Scabies can be acquired by skin to skin contact or via bedding or linen, as the mite can survive for a few days off its host. It is contagious condition and spreads from person to person. Itching is characteristically more at night.
You work with a clothing ware house where you handle sacks every day and they are kept outside where probably stray animals infected with scabies sit at night (so they sometimes smell of urine).
Since all the coworkers are affected, scabies is evident.
This can be confirmed clinically by history and microscopic examination.
You may consult a dermatologist
for exact diagnosis and simultaneous treatment of all workers.
Hope this solves your query.