Had clear scope d/ w IBS - does IBS cause lower left abdominal constant discomfort? The pain however is not relieved after movement?

Maybe not. The key to your answer is in the definition of "constant discomfort." if you are awakening from sleep due to pain, your symptoms don't come and go but are unchanging and ever present (or are actually worsening) then it is unlikely you have irritable bowel syndrome. In such a case, further evaluation is warranted rather than you just taking symptom-based medicine.