Recovery after mastectomy

This can differ vastly from person to person. Good that it is getting better, but if you are concerned at all about it, perhaps you could ask to see a physio so that you can get assessed and helped as needed.

If I was you I would get on to doctor or breast nurse and get some specialist physiotherapy . The problem you seem to have is cording and physio will ping them off .  It's best done as soon as possible it won't be painful and mobility will return very quickly, some mobility will return immediately. 

Jayne 

What does “pinging” involve please 

Popping off the cords under the skin that are stuck to the underside of the skin when massaged off they make a popping or pinging sound .  They should not be stuck to your skin as it stops free movement of your arm .