Hi I wonder if I could have some advice please?

I went for appointment on Wednesday evening and ended up having core biopsies of my left breast and markers being put it. Had a lot of pain with a mixture of ultrasound/mamagrams (back and forth into each room) 8 mamagrams in total then numbed for the biopsies which wasn’t as scary as I thought. 
been taking paracetamol as advised, and my breast is less painful, although I have pain in other areas of my body, which is ongoing. Doesn’t feel as sore now, but the pain in my left arm is getting unbearable and paracetamol doesn’t seem to be taking the edge off. It’s the top of my arm, but I just can’t get it comfortable and feels like I’ve got cramp going up the centre of my hand right the way up my arm. I’m barely sleeping anyway with worry I’m trying to tell myself it’s okay and I’ll deal with what happens when it happens, but I’m really struggling with my arm? 

Any ideas of what I can do to get comfortable?

Thankyou for your time