What Is The Treatment For Pain In The Shoulder , Back And Breast?

hello, my name is Melina I'm 20years old and I have a young child. I used too when I was pregnant get bad pains on my back, my right shoulder and my righ side of my brest. Well I am not pregnant and I'm getting the same pains again yes I am under alot of stress but I'm woundering what it could be thank you