Not sure about seeing floaters before migraines, but what you see could be migraine auras. I have them and they affect my field of vision prior to a migraine. I'll see flashy/persistent "dots" or completely be unable to focus on certain things, like I have a blind spot. Hate it, but it at least gives me time to grab meds before the pain sets in. Usually happens ~20-60 minutes before onset.
Not sure about seeing floaters before migraines, but what you see could be migraine auras. I have them and they affect my field of vision prior to a migraine. I'll see flashy/persistent "dots" or completely be unable to focus on certain things, like I have a blind spot. Hate it, but it at least gives me time to grab meds before the pain sets in. Usually happens ~20-60 minutes before onset.