I had 20 treatments. Right after each treatment, I apply fresh aloe vera on the treated breast and other areas around it. I reapplied a few times a day and clean it out before each treatment just in case it interfered with the effectiveness of radiation. I would recommend continue in with aloe vera/cream for 2 weeks after the last treatment. You can get aloe vera plant at a nursery. Get the big, mature one. Just make sure you clean it well and if you notice any blister, inform the radiologist right away so you can get prescription cream. I had no blisters until few days after, probably because I stop applying aloe vera too soon. They healed pretty quick. The radiologist who checked my skin at the completion of the radiation said that I tolerated well, but my skin is dry. So if you notice that your skin is dry, use lotion.
If you search this website, you’ll see lots of recommendations on how to prevent radiation burn. I used fresh aloe vera because it worked very effectively for my sun burns.
If you feel tired, ask your doctor to check your blood iron. Radiation can cause iron deficiency. My aunt had it but she recovered well. My understanding is that it rarely happens. I was able to continue my regular exercise during that time.

Take up walking, it helps you stay calm and relaxed. You’ll be fine. Hugs.