Can anyone tell me where to go to get Arcoxia tablets (also known as ETORICOXIB) or Voltarol tablets (aka DICLOFLEX / Diclofenac Sodium).
None of the pharmacies I've tried know what these two medecines are, neither did a hospital I tried (they are to alleviate pain in the joints).

The International name is Voltaren,
the Brand Name in China is Novartis,

and the Chinese name is

Votalin (FuTaLin, 扶他林）
It is available OTC, there are tablets as well as there is an ointment available
Alternatively you can try the famous YunNanBaiYao 云南白药 ....

Thanks very much for that information.
Any idea about Arcoxia / ETORICOXIB tablets ?

The Chinese current name for Arcoxia / ETORICOXIB tablets is 依托考昔(YiTuoKaoXi),
The Chinese brand name for Arcoxia / ETORICOXIB tablets is 安康信(AnKangXin),
I think it is a Prescription Drug which you can get at some big hospitals.