From what you describe, the pain seems to be located in the sacroiliac joint, the joint formed where the lower spine meets the pelvis. This kind of pain can make it hard to do ordinary activities, like bending over to load the dishwasher or make the bed.
Fortunately, there are several ways to reduce sacroiliac joint pain. Physical therapy seems to work well, especially for people who have been in pain for relatively short periods of time. But people with chronic pain that's been bothering them for a few months may also benefit from physical therapy. Other treatment options include wearing a brace or getting special injections. In rare cases, fusion surgery may be needed to keep the joint from moving. Talk with your doctor to discuss which treatment may work best for you.