Please help -- Port Aches when Exercising

Hi Everyone! I am a 2 year bandster and have had a pretty good experience so far. I've been noticing a real achy pain in my port area when I'm exercising -- running/elliptical, etc. I've been doing more sit ups lately so maybe that's aggravating it? I've been blessed enough to have very few problems with my band, but now I'm getting a little nervous about the pain and the WORST part is that it makes me not want to exercise!!

There is no pain at all when I'm resting or doing daily activities. THis is really just while exercising. That said, this is a NEW thing. I used to do a ton of situps with no problems and I've been jogging for a while.

So... long story short:

1. Has anyone else here gone through this? I really appreciate hearing about it because just knowing that this

isn't completely abnormal is pretty helpful. I am sure that I should probably go see my doc right? I haven't seen him in a year! Unbelievable how time flies.

2. Could this have something to do with either building abdominal muscles or maybe with getting a little skinnier (thank god!). I have probably lost about 40 pounds in 2 years. Need to lose another 20 or so.