Should I seek a divorce from my bewitched husband who resides in another country, or should I try to cure him remotely?

If you can strive to help him by informing his relatives or by informing him directly, then do so. Otherwise, if you cannot endure, there is no blame upon you for seeking a divorce to remove harm from yourself. Islamic law permits this for a woman when there is harm, and this is indicated by the hadith (definition): "Any woman who asks her husband for a divorce without any hardship, the scent of Paradise will be forbidden to her." Hardship here refers to the severe difficulty that necessitates separation.