I can see why you would try cupping after seeing the marks on the backs of Olympic swimmers! But, it is really silly medicine---will they try leeches next? Just because the Chinese did something in the 5th century BC does not mean it works for us in the 21st century!!
I have to tell you that I went to a lymphatic massage therapist with something of the same attitude---I will try anything. When the really nice woman took the time to explain how the lymphatic system worked to me, it did start to make sense. she did a wonderful massage of my knee and then gave me a "wrap" to wear at night or when I was resting. Really? I thought it was hookum, but I thought why not try it? And I was so surprised in the am to see a visible reduction of my swelling. I wore the wrap for almost six weeks after my revision surgery and by then, all the swelling was gone.
I don't blame you for trying everything---I sure did. But, the most effective thing that I found was lymphatic massage. Ask your PT for a recommendation---Mine recommended the woman I went to see.