6 days late for my period, not pregnant. keep experiencing dizzy spells and blurred vision. right eye feels weird too and brain fog. what's going on?

Some thoughts...: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Pregnancy is the common cause of a missed period, if sexually active. An in-person exam is needed to evaluate dizzy spells and new blurred vision.