Could these also be symptoms of IBS?

I am a 52 year old female in good health. I had a hysterectomy 5 years ago, leaving my right ovary. I have IBS and have always had problems with constipation. Lately, I have experienced pain in my right back side and at night I awaken with leg pains. I have a lot of gas, cramping, and when I'm not constipated I have to go to the bathroom several times a day. Any suggestions on what is going on?