I have been having a bloated stomach for about 2 weeks now. It is very uncomfortable and hard. I have also had some lower back pain on both sides of my back only. The bloating is pretty much constant. I have also been increasingly gaining wait. I gained 2 pounds last week which seems to be the pattern, somewhere between 1-2 pounds per week. Since November of last year I have gained around 44 pounds. Probably around 20+ of that was gained in the last 3 months. What could be causing the bloating & weight gain. I have not changed my eating habits much.