Dear Joy, what a tough nut to crack, but you will get this sorted, and I'm so glad you already got so many great suggestions. We are all thinking along and if one thing doesn't work out, we are ready to brainstorm the next with you.
I know a little bit what you are going through: my sister has a neurostimulator implanted in her abdomen for severe chronic pain, but the entire device is in her abdomen. Which is less of a problem than yours, but depending on the fabric and where the waistband hits she does get painful pressure on that spot sometimes. She likes skinny jeans/jeggings with lots of stretch from Gap because they don't have that issue.
For you, my first thought was also suspenders (high five, Gigi!). You could make it a statement item for you in fun patterns and colours (or neutrals if that's what you prefer) when wearing them uncovered. And if you are wearing them under tops and dresses, nobody will be the wiser.
My other thought was also sweater dresses and asymmetrical tunics with tall boots and knee-high socks. Or those hold-up tights that stick to your thighs.
I'm going to keep thinking about this!