Homeopathy is not exactly based on herbs. You are taking a distillation or reduction of an infused solution that is reduced sometimes 100,000 times. Is there any kind of imprint of the original left? On the other hand, arnica gel is accepted in hospitals, I hear, though it may work differently.
I did try some remedy that sort of worked, but also made me burp. Anyway, if you are serious about homeopathy, then you need to consult with a professional homeopathist, who will diagnose what you need and give you the proper dosing. An over-the-counter remedy will not be just what you need,