I found this info on an American drug website:

What side effects may I notice from taking folic acid? (Back to top)
Folic acid is a water-soluble vitamin and when taken at prescribed doses is unlikely to cause side effects in patients with healthy kidneys. Side effects may be caused by an allergy to folic acid.
Possible side effects with folic acid include:
•chest tightness or pain
•depression
•irritability
•loss of appetite
•nausea, vomiting
•skin rash, redness and itching
•wheezing or shortness of breath

I'm stumped! Maybe you have an allergy to it??

The only other thing I could suggest would be to eat lots of foods with naturally occurring folate ie. broccoli, whole grains/cereals, fruits, beans, leafy green vegetables, etc and cut out the supplements.

Love
Goldilocks
-xxxooo-