Get thee to the pharmacy on your lunch break and get some diclofenac most commonly sold as volterol (make sure you eat something before you take it). Ask for a DSE (Display Screen Equipment) assessment they will look at your desk/chair/computer set up and make recommendations, make sure you mention your hip to the assessor if you can back it up with a proper medical diagnosis they will have to provide you with new equipment, but if you cannot they will most likely supply you with it anyway to cover themselves.
Edit - As a new employee you should have one at the start or close to the start of your job anyway. It may be worth reminding them of this.
Get thee to the pharmacy on your lunch break and get some diclofenac most commonly sold as volterol (make sure you eat something before you take it). Ask for a DSE (Display Screen Equipment) assessment they will look at your desk/chair/computer set up and make recommendations, make sure you mention your hip to the assessor if you can back it up with a proper medical diagnosis they will have to provide you with new equipment, but if you cannot they will most likely supply you with it anyway to cover themselves.
Edit - As a new employee you should have one at the start or close to the start of your job anyway. It may be worth reminding them of this.