What Causes Abnormal Periods And Leg Pain?

I am 31years old women, unmarried and had abnormal periods for the last 5-6 years. I have never felt as stressed and uptight in my life. I sometimes do have severe pain in my legs and swelling. I bleed almost every day for 12 months. Not heavy bleeding and no pain but still bleeding every day. I have also gained a lot of weight which was making me very depressed. Will let you know what do I do. Please assist as I am very worried