Ay, I feel you, mama, a few of us moms have experienced that recurring left side and back pain, and it's really draining lalo na pag recurring siya. I'd definitely recommend checking with your doctor though, kasi masyadong vague ang symptoms at pwedeng maraming reasons (posture, stress, muscle strain, or something else), so better safe than sorry with a professional check-up para ma-rule out anything serious. In the meantime, try to be mindful ng posture mo lalo na kung naghahandle ka ng kids or nag-carry ng load, and maybe some gentle stretching or warm compress when it flares up, pero talaga, let a doctor assess you first para may peace of mind ka. Hoping you feel better soon!