My lower back is aching and no matter which way i stand, sit, or move, it hurts. i was fine this morning and throughout the day it has progressively gotten worse. what could be causing the pain?

Muscle spasm?: Lower back pain is typically caused by muscle spasms. If your Dr has examined you and ruled out other more serious conditions, try gentle stretching exercises. https://www.prevention.com/fitness/a20506161/5-stretches-to-ease-your-lower-back-pain/. You can also apply alternating heat and cold packs, or analgesics such as acetaminophen and aspirin.