Why before period severe back pain, brown milky blood, bloated belly, can't walk why does this happens?

Maybe PMS.: Premenstrual Syndrome (PMS) Symptoms can include pelvic/ abdominal cramping, nausea, bloating, weight gain, moodiness, irritability, pain & swelling of breasts, feeling tired, insomnia, headaches, ^ acne, food cravings, ^ appetite, swelling of hands & feet, dizziness, thinking less clearly, urinary sxs & exacerbation of chronic conditions.