I Have Had Diarrhea For More Than 10 Months. It

I have had diarrhea for more than 10 months. It concerns me because it is very pale in color all the time. I have alot of gas mainly in the morning. I have just recently been told that I have a vitamin D deficiency. I feel that I have no energy and my sleep is very irregular. I wake up at least 3 to 4 times a night. I have gained weight even with having this problem. I just turned 51 I still have very heavy periods. I have had a major back surgery in 07 so I do take pain medication so it is concerning to me that I still have this bowel problem and the fact that it is such a light color consistently no matter what I eat.