C.S.
Hi C.,
I went through the same thing this pregnancy. I had pain in the same places and my hips were so bad some days I was limping in agony. With pain across your back like it's your kidney's, they may be overloaded like mine were. I really recommend seeing a nutritionist. Unfortunately doctors rarely take a single nutrition class! If it is your kidneys, then you may want to be pickier about what you're eating.
I stopped eating anything with gluten, dairy and meat while I was going through this. You still get lots of protein from fruits and veggies (actually it's not the protein that you need it's the amino acids that are the building blocks of life). If you're concerned about protein intake, pick up hemp seed protein powder and add it to a morning smoothie.
Within a week of cutting these things out I was sooo much better. It's amazing how much food affects us. Dairy and meat also take a lot for our bodies to process, which is slowed down by being pregnant. Also meat and dairy, especially non-organic, is filled with so many toxins that would weigh your kidneys down with extra work.
I know it may seem difficult to cut out breads and pastas, but try it for 2 weeks and see how you feel. If you need a recommendation for a nutritionist, let me know and I'll give you her contact info.
Oh... and now I'm 19 weeks and doing great! I'm able to exercise everyday, stuffing my face (with veggies and fruit of course!), and my skin is starting to glow. Though I'm not showing yet either, but we both will soon enough!