(I had 28 sessions of proton radiation, with 6 months of Eligard.)

For each guy it’s different, much depending on the planning and preparation decisions made prior to treatments.
Due to the robust resistance-training and cardio program (I’ve always been a gym-rat so, ramping this up was no big deal), my side-effects from ADT were minimal and quite tolerable: just minor “warm” flashes and muscle atrophy. Did have a loss of libido, but no ED. No mood swings, emotions, fatigue, forgetfulness, confusion, memory loss, insomnia, night sweats, weight gain, etc., things that are typically mentioned.
Now (4+ years later), with 20/20 hindsight and T levels all normal, I view that hormone therapy experience as having been just a minor annoyance. All things considered, I got through the hormone therapy quite well.

Good luck with your decision!