Melanoma

I have just completed my 5th week of radiation therapy after 4 surgeries this year. Yesterday I began losing my voice and having difficulty talking. No pain or difficulity eating, when I feel like eating. Mt radiation /Oncologist is off for the weekend so I cannt ask about this. The treatment area is on my left chest area and around to the arm pit. There is slight exposure to my lower neck. Is this to be expected?