I Have Had Dark Urine For About A Week And

I have had dark urine for about a week and an upset or "growling stomach". I had diarrhea earlier this week but it has subsided. I have had dark urine in the past but not for 4 or 5 days. I have an annual physical and on a low dose blood pressure medicine, but pressure is perfect.
I have been taking for about three weeks a purified omega 7 supplement at the suggestion of a neighbor who was having some back and foot problems ( I have had a foot problem for 4 years and have had surgery, seen two podiatrist, a acupuncturist a spine doctor, orthopedic surgeon and much physical therapy- not looking for an answer to this problem). Any thoughts on the dark urine?
Thank you.
Mark