Hello there,
I don't know if this helps, but I also have gotten the sharp pain, worsening when I sit. My port ended up having some scar tissue growth around it, I still get some sharp jabs sometimes and can not lay on my side, but it is not as bad as before. The scar tissue was nothing big they just had to push harder to get the needle in on my fill and it made the port access kinda turn to the side a bit, but it is fine now. Now that I am so much thinner you can actually see it from the side, thats kinda gross,but comes with the territory....lol.
Best of luck to you.