What is causing the pain when I lay on my back of my side?

I had double masctemony in March. Due to the skin dying, I had a latissimus dorsi flap surgery 3 days later. Now, I am still so uncomfortable when I try to lie down on either side or my back. It feels like things are twisted under the skin, but I have little feeling on my skin. Lots of burning and aching. the surgery was a huge success.And, yes I did have reconstruction started at the same time. So,I have expanders in and waiting to have them removed and replaced on Sept 15th,

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