I can sympathise with you!!! For the last couple of weeks I have been getting bad hip/lower back pain mainlyon my right side. Sometimes it will feel fine, and then it will kinda 'catch', and the pain is horrendous!!! It is generally worse at night, and having to get in and out of bed to pee all the time at the moment isn't helping matters!!! I don't really know what it is, but have put it down to the effect of hormones relaxing all the joints and ligaments....if you already have flexible joints, they are going to slip out of place more easily!! Ouch!!! xx