I've seen a post similar to this last year which was also posted by a woman who expressed the same thing as you.

How long into your fast do you need to be before you start experiencing stronger Orgasms? Seems to work opposite with men unfortunately (Me at least, 28 m)

first 50 hours I'm fine but it's not any better, either. But after that the migraines start kicking in and I start feeling physically weaker. My sense of smell becomes stronger than fuck but my sex drive just plummets 6 feet under and becomes the last thing I even want to think about. (Doesn't help that sex increases heart rate which does not mesh well at all with a migrane)

And yes I do get a proper dose of electrolytes but I just wasn't designed for fasts beyond 2 days I guess? :/ I guess maybe if I just powered through the migraine and went for it l, it would be great? But I don't even think I can work up the courage to get into it.