Lymphedema and/or something else

Hi everyone - I have stage 4 inflammatory breast cancer. About 5 weeks ago I injured my thumb. At the time it wasn't terrible and I didn't get it checked out. I've had intermittent pain, but nothing too bad. Last monday I noticed my thumb was swollen and was a little more painful. The next morning my wrist was a little swollen and an area (b/w my mid forearm and just above the elbow) was a weird purplish/reddish color. I saw my dr and they ruled out a blood clot and said it was lymphedema. I saw a lymph pt this past monday who said my thumb may be an orthopedic issue and the coloring may be something else. My thumb is the only part of my hand that's swollen (and it's the only part of my whole arm that's consistently swollen) and painful. My dr is trying to get in touch with the pt to get his take on things, but I'm sitting here feeling like I should do something. I was thinking of going to a walk in and getting an X-ray of my thumb/hand. I just don't know what to do and was hoping someone here may have some advice.