All I was saying is that you can't ride 2 horses in a race- just like you can't expect to use Homeopathy and conventional medicine and expect a wonderful result!
Nat Mur has obviously helped but it seems that you still have a 'tendency' to get cold sores. A different remedy or a different potency might help.
I believe that the best remedy would get rid of them altogether.A second best remedy could build up your vital force so that if you did get one it would not cause problems and would be thrown off quickly.
If you are still getting cold sores that you are having to use conventional medicine to get rid of then , in my opinion, a different remedy needs to be looked for.