Dear @Newbie3312, it’s early days and numbness and pains are quite normal although can very very uncomfortable! Numbness back of arm is very common, I still have that 8 months later but some of the other numb areas got better, it’s hard to take a few Nodes without hitting a small nerve that is connected to the back of the arm.
Rotten shooting pains are a bummer cos they take you by surprise. There’s a lot of healing going on in the arm tissues and nerves can get irritated and they dont like it!!
Try upping your pain relief a bit, avoid over stretching early on, ice packs or cold packs may still help.
Hope this helps
lots of love Tinks xx