CLENCH!!
Clench your bum, your pelvic floor and that will help you clench your corset muscles.
Do this when you turn in bed, or put the clutch down, or turn when pushing a trolley/ pushchair.
Lying on a duvet in bed, and even better if you can find a silky sheet or blanket too, that will help you move around in bed.
Get in and out of bed like a pendulum, head goes down, feet come up. Feet go down, head comes up- try and get a bit of a swing to it.
Ice the area regularly- 3 times a day for 10 minutes. Regular use can help with inflammation.
Tilt your pelvis forward, you may find you are standing with your bum sticking out. Rocking pelvis forwards and backwards acts as a sort of warm up when you have been sitting/ lying for a while.
This was advice I got from friends, and from a group physio session. Give them a try while you wait for a referral- they have all really helped me.