Anyone had stabbing, burning muscle pain in lat muscles or side?

When I lost a lot of weight about 5 years ago, the same thing happened that is happening now. I am 5 months post-op, and I am having stabbing, burning, agonizing pain in my right side, under the shoulder muscle and in my latissimus dorsi (lat) muscle. This has occurred on both sides of my body. It doesn't hurt all the time, only when I move a certain way or move quickly with my right arm. The pain is absolutely terrifying, and lasts for about 15 seconds. Also, the skin feels numb to the touch over the point where the pain is happening...so there is nerve involvement. I am supplementing with calcium and potassium, and also drinking all my fluids. I am not doing any unusual exercise or stressing that area of my body. Any suggestions? Is there a doctor in the house? Anyone?

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