Hi! Weird that you should have this too! I'm in the same boat with the hip-ish area for pain (lower left abdomen, radiating into the hip/upper thigh area). I've had it off and on for months now, with it now escalating sometimes into stronger pain rather than just pressure. My daughter it 7 1/2 months old, 17 pounds, and I too lost all of the weight in 5 or six months, and then some. I love that your doctor told you not to pick up your son. Wow... I did go to the OB last week, they ran a culture, are doing some urine tests, and I'm getting an ultrasound in a few weeks. There is a history of ovarian cancer in my family, which may be the reason for all of the tests, but they wanted to do the tests before I mentioned that history. I have to call today about the results from the tests. The doctor did say that if these tests were negative, I should follow up with my GP. I did some research on my own when the pain disappeared after I did a workout tape that stretched out the muscles in that area. The sacroiliac joint and the hip flexor muscles of your pelvic/hip area get stretched and strained during pregnancy. By using baby carriers (which I do constantly on long walks) and lots of lifting before your joints and muscles are ready after childbirth (I started working out/walking with her in a front carrier within a week afterwards) can cause additional strains on the muscles and joints. This can lead to spasms when the muscles are constricting and contracting. Like I said, I don't know which of these is the answer yet, if any of them are (joints, muscles, ovaries, etc.). Hope this gives you a little bit of a starting place for info. I would definitely have someone, whether your GP or OB, check it out though. Best wishes!!!