Your shower story is hilarious. I got a bad abscess last winter and wound up at home with a PICC line for iv antibiotics for 3 weeks. They absolutely CAN NOT get wet. Or dirty. Or anything. I would put a cloth 'sock' around the dangling line, then we wrapped my entire upper arm in press and seal wrap, then tape the top and bottoms with tape. It got a little sweaty, but never leaked.
With a trip to the doctor, that's a lot of activity for your first week healing. I'm not surprised things hurt worse. More elevation and ice, and just make in through the days. At 2 weeks I felt so much better it was a little shocking. It will go fast.