I wish I had answers for you Kat! It is hard with the presentation of your symptoms and such to say 'Oh yea, those are CH.' I just don't have a good answer to that one.
The ramp-up at the same time of year does sound like it of course. CCH's have that occur. And some people begin with not so 'typical' CH, only to have it become more obviously CH over time.
On the other hand, because there is one, you are on the Extended Release Verap. The short acting works better. As in you take it three times a day, not twice. Patients have a better response to the short acting version. Can you get your doctor to change that so that you can try it? And 320mg/day is a fairly low dose. So, you could get the short acting and go a bit higher to see if that does a better job. Just make sure that your BP is okay with a higher dose.
You are taking the full D3 Regimen, right? The vitamins all work together. Have you added Benadryl? Sorry, I don't recall.
Hugs!!!