dropinthe I had this problem and it was found to be my Pituitary Gland, I particularly had problems with 'prolactin - which stimulates milk production after giving birth' it didn't stop when it was supposed to, yes I stopped producing milk but the hormones built up and gave me the dizziness you describe, it took 12 months to diagnose, I was put on a corse of tablets and it seem to help, but even now I still have episodes.
About The Pituitary Gland
Anatomy of the pituitary gland:
The pituitary gland is sometimes called the "master" gland of the endocrine system, because it controls the functions of the other endocrine glands. The pituitary gland is no larger than a pea, and is located at the base of the brain. The gland is attached to the hypothalumus (a part of the brain that affects the pituitary gland) by nerve fibers. The pituitary gland itself consists of three sections:
the anterior lobe
the intermediate lobe
the posterior lobe
Functions of the pituitary gland:
Each lobe of the pituitary gland produces certain hormones.
anterior lobe:
growth hormone
prolactin - to stimulate milk production after giving birth
ACTH (adrenocorticotropic hormone) - to stimulate the adrenal glands
TSH (thyroid-stimulating hormone) - to stimulate the thyroid gland
FSH (follicle-stimulating hormone) - to stimulate the ovaries and testes
LH (luteinizing hormone) - to stimulate the ovaries or testes
intermediate lobe:
melanocyte-stimulating hormone - to control skin pigmentation
posterior lobe:
ADH (antidiuretic hormone) - to increase absorption of water into the blood
by the kidneys
oxytocin - to contract the uterus during childbirth and stimulate milk production.