While this can be uncomfortable topic (both figuratively and literally), just about everyone should be able to relate to it!
When I was first diagnosed with Type 2 in 5/06, I was also diagnosed with high cholesterol, high blood pressure, etc. My doctor promptly prescribed me various medications, including Metformin, Benazapril, Crestor, etc. I started taking them, along with making drastic changes to my diet, and all of the sudden I started having problems with constipation. I talked, actually argued, with my doctor about why I was experiencing this problem. I took various laxatives, drank liquids, before I eventually became more regular. After a while I was able to stop taking a laxative.
However, my bowel habits have forever changed since being diagnosed with T2. I beleive it is because of the Metformin and other meds. Since being diagnosed as T2 when I have “to go”, I have to go NOW. Fortuanately I work around a lot of port-a-potties. Being an avid hunter and fisherman, I have learned the value of packing toilet paper when going hunting / fishing.
You probably have already done this, but I would suggest consulting with your doctor concerning your medications and the constipation. It sounds to me like you have been doing the proper things like drinking lots of liquids, etc. I have also found that drinking a caffeinated drink also helped me.