Sleeping on my left side

I am in my 2nd trimester. So i am making a conscious effort to sleep on my left side ( since its the recommended position) Initially i just used a bolster to help me, but i am aching so much that i decided to get one of those pregnancy pillow. But it is still not helping! I woke up in the middle of the night, having aches on the left side of my body. Especially my arms and my left pelvis area! Anyone experiencing the same problem? Any advices?