I'm 32 yrs old, i have lower back pain and pain in the pelvic area and hot flashes with no period, had my tubes tied 10mths ago after having baby #3.

This is concerning: This combination of symptoms that you describe concern me. If you were only having hot flashes and no period, I might suspect premature menopause. Lab tests for specific hormones could confirm or refute this. But the low back and pelvic pain need to be evaluated promptly. You might have a uterine or pelvic infection, an ectopic pregnancy or malignancy. Don't wait.