Oh PP my heart goes out to you hun! You know how I suffered...things that helped were - never cross your legs, keep your weight balaced, reduce the amount of walking you do, just don't carry stuff, no lifting, no pushing shopping trolleys, don't even lift the washing basket...don't walk if you can stand, don't stand if you can sit, don't sit if you can lie down. Don't do the grocery shopping. Just don't walk up or down stairs or up or down inclines - ever. Suck your tummy muscles in and tighten your pelvic floor (ie "brace") whenever you sit down/stand up/bend over/pick things up. Use as many pillows as you need in bed (under tummy, between legs). See a physio and get some good techniques for rolling over in bed (eg roll forwards onto your elbows and change sides that way instead of rolling onto your back), sitting up from lying, etc. They should be able to give you a good support thing like a belt or some tubigrip which looks horrible but really does make a difference. They will also give you some stretches/exercises which will help with the pain. You might even get a free bum massage every fortnight like me (LOL). Ice and heat both give some relief, but some times you might just have to take painkillers to get you through.

BTW don't despair, it does resolve fairly quickly for most women after birth - if you get to the 4-6 week mark and you're still feeling ouchy, you can see a women's physio thru ACT health - once you're not PG anymore the exercises etc work a lot more quickly. Also a lot of women swear by pilates to recover and a lot of the exercises the ACT health lady gives are variants on the pilates methods.

PS - I"m really really serious about that first paragraph. This is one situation in your life when "pushing thru the pain" is NOT helpful. Do whatever you have to to minimise the load on your pelvis. I'm not kidding. I'm now 3.5 cm shorter than I was before my pregnancy and I reckon it's purely from my pelvis moving during that time.