I had a bad bout of it for several weeks two years ago - it very gradually resolved, taking nearly two months to go away. In the midst of it, I was beginning to feel it would never go away, as it was constant. I discovered, belatedly, that my glasses from the late 1990s already had prisms in the lenses and those from early 1990s did not. I was very nearsighted anyway, so slight double vision at a distance must have only shown up on the exam and the late 90s doc put prisms in without really communicating that to me. I have the same prescription that I had in the late 1990s. I am now having more trouble focusing my near vision with my glasses on. Whether that is MS acting up or just getting older, I don't know.
Good luck and may it all resolve! Keep us posted.