I was sometimes a bit tender after treatment and the port occasionally was sore when trying to sleep. I mean we have got a piece of leggo sewn under our skin I guess, lol. I presume some of the discomfort after treatment was just the port pushing against the muscle when the needle is put in. I've no idea really. I just know it did settle but took a bit of time. I had to initially sleep holding a pillow. For some reason it helped. I occasionally get sore at collar bone now even though active treatment has finished and most likely this is after I've been hunching my shoulders. ..(involuntary of course) and I'm guessing it is tugging on the internal sutures.
Hope improves for you.
Kath x