@srm . I am sorry you are dealing with this, however there is help, there is a compounded liquid that is amazing. To help these heal. I know you are probably at your doctors appt. and they will be able to assess those mouth sores. As long as they are not fungal, they can prescribe it. Also I found that using children’s toothpaste or just baking soda helped them heal faster. I had a mouth full from the chemo. I suspect the short of breath and exhaustion is from the radiation. I wish I had a suggestion, but the truth is, you just have to let your body rest and heal. I was so tired every step at the grocery store was like I had run a marathon, and I took a couple naps to get through a workday. Did the doctor give you hope of relief for your mouth today?