Did you ever figure out what the issue is? I also have
swollen ankles, feet, and lower legs too. My doctor is sending me to neurology. It's so bad sometimes I can't walk well and I pull muscles/tendons. It can also be very painful. I don't have the red splotches or numb spots that you describe. Like you, I watch my sodium, don't sit or stand for too long, and have had all the blood tests I should.