Immunotherapy on its own

Hi all

I’ve just finished 6 months of chemo and immunotherapy (pembro) and next up is surgery, radio etc. I’m also carrying on immunotherapy for another 6 months. Can anyone advise on how immunotherapy alone is? Will I feel sick? Fatigue? I’m looking forward to a quick 30 min infusion after the long days of chemo I’m used to but have no idea how I’ll feel afterwards with the Pembro alone.

Thanks