Melanoma stage 3

hello - just been diagnosed with stage 3 A melanoma. Found in sentinel lymph node. Melanoma removed.  Because i’m being treated for breast cancer I’m already having immunotherapy with three months left.  The oncologist said that was good for the Melanoma.  Been for MRI of brain and CT of lungs and liver.  Now waiting for results.  Last PET scan in September for the breast cancer was clear. 

all feels so overwhelming