Hi Nathalie,
Your oil will definitely still have the medicinal components, it just may be that the oil itself has begun to break down a little bit. You will be able to smell this change over time. But don’t worry about that too much just keep smelling it as you use it.
No need to redo your oil. It may be absolutely fine. Try the sitting and decanting process and see how it is once you have done this.
Warmly,
Benna