Empire',
Sorry you are experiencing all this.
Yep to what all the other folks said -- unpredictable, often shifting, who knows what effects meds have. Damned thing will fool you every time. Over many years, some people have identified what seem like consistent patterns in how their cycles end. For example, my daughter's typically end with a few days/nights of very severe attacks, and then suddenly they're gone. And sometimes that's not the case and they just taper down, and sometimes she has a few days of severe attacks and thinks it's ending but it isn't, which is a big bummer. It's good to be attentive to these things (you can't really help but be), but trying to figure it out is a risky game if it gets your hopes up. The most important thing is to have your treatments in place -- D3 levels up; O2 with all the proper system components; nasal or injectable triptan for breakthroughs; busting if that's something you want to do. . . . Then you're better able to handle the Ali shuffle and the rope-a-dope when they come your way.
Have you tried drinking down an energy shot (such as 5-Hour Energy) or an energy drink (such as Red Bull) or even a strong cup of coffee or some other source of caffeine (spiny likes V8 Energy things) at the first sign of an attack? Generally, these are used along with oxygen, but can make a difference in severity or duration on their own. (And they don't keep most people up at night.)
Incidentally, although your verap dose is probably too low to make a difference, it is the general experience (or belief) here that the instant release is more effective than extended release (ER). If you're only taking it once a day, you almost certainly have the ER.