Full report: I got the J&J on Friday the 9th at about 4pm. The jab itself didn't hurt but the actual injection burned considerably going in; not terrible but definitely uncomfortable. Felt fine the rest of the day, tried to move my arm around a bit to avoid as much soreness as possible but arm didn't hurt after the shot.
Saturday: woke up 9am feeling crappy. Fatigued, muscle pain, low fever, and arm sore as hell at the injection site. Took my wife to go get her first Moderna shot at noon. By the time we got home at 1pm I felt even worse; completely fatigued and considerably more muscle pain/body ache. Slept for 3 hours in the middle of the day until about 5pm. Found the energy to eat some dinner and watch tv on the couch for a couple hours and then back to bed.
Sunday: less crappy, but definitely still feeling it in regards to fatigue and muscle pain. Fever pretty much gone. Arm sore as hell and injection site was extremely sore to the touch. Enough motivation/energy to do some laundry and the dishes, but not enough to go up a flight of stairs to play some video games.
Monday: almost back to normal. Still a touch fatigued, but no fever or muscle pain. Injection site still very tender to the touch and sore.
Tuesday-Thursday: normal other than arm soreness and injection site being very tender.
Friday (1 week): first morning that I woke up and my arm wasn't immediately sore. Injection site is still tender if I rub my arm but good other than that.