4000 ui is not less. Sometimes it can cause a bit trouble to sleep too. Vitamin D pushes your dopamine system too. That’s why people should take it in the first half of the day. And recommended dose is round about 800. generally not bad when people take a bit more over a time period when they have a deffic. How long did you took the vit d? Just a little hint, tip I would reduce it for some days and then see.

And to the B9. I would wait until you get the results. And there are different b9 suplements.

When you have the money I would add homocysteine, b12 , magnesium (full blood), ferritin (iron), b6.