I fear chemo more than radiation, still do. Radiation was doable, did it several times, but still difficult, but no where near what chemo did or can do acutely, even long term. Chemo put me in the hospital, acute care facility for 6 months, and have plenty of stories from them both. Usually the optimal wait from surgery to radiation is 4-6 weeks, but could be longer based on your healing.
Good luck with everything.