Hi, I think you are having irregular scanty periods as a sign of approaching menopause
. Any way if you want to rule out any pathology you may do a trans- vaginal ultrasound
scan & visit a gynecologist for evaluation. I think you should keep your weight under control as it may also be the cause of your period problem.
For your weight, you should restrict starchy, oily & sweet food. Also, try to decrease total calorie intake. You should increase your physical activity & may consult a dietitian for help.
For your pain I suggest you consult a physiotherapist in person. Take care.