Welcome to this site.
I have met some of the nicest people here and I am not about to leave.
In regards to swimming you should check with your doctor to get some tegaderm dressing. It is one of the most effective dressings to put over wounds, catheters etc but it's not cheap.
I had tegaderm dressing for protecting my PD catheter when going swimming and I also had it on when I had to return on hemo to put over my tunneled cather ( where it would stay till the next dialysis session ).
If the dressing is good enough to stay on for days and be able to take showers with it etc it will most certainly be good enough for you to go and take a dip every once in a while
Don't let details get in your way of enjoying life, just learn to work with them. It's totally possible!