I m always dizzy and lightheaded when I stand up. Also when I get out of the shower these things have gotten 10x worst. When I m on my period I always faint (lucky it hasn t happened in a while) and I have mood swings and over think things ALL THE TIME! I m a teenager so I don t know if it s normal.
It may not be normal. Symptoms described by you're suggesting of postural (orthostatic) hypotension. Get your BP in supine and standing position. U may need other autonomic function testing also. Take plenty of oral fluids, avoid abrupt standing.