Yeah, first dose kicked my butt too. But only for about 36 hours. Second dose wasn't bad at all compared to that. Got second dose around 4pm the next day woke up with a sore spot on the arm, but no pain with movement. Felt a little tired the following day, but nothing too bad. Eyes felt warm. But, unlike the first dose, was actually able to get decent sleep. Woke up feeling fine the following day. Tried going for a run, and much like the first vaccine, wasn't able to run as far or fast as normal due to a side stitch (vaccine related or not, not sure).
Also not sure what it means to have a robust reaction on the first shot and not much on the second. I figured I may have had an asymptomatic infection prior, which is why the vaccine made me feel like crap. But either I had high circulating antibody levels that neutralized the second vaccine pretty early, or there's something else going on. Second vaccine dose was 24 days following the first. Personally would've preferred to wait 28, but if I didn't take it a shot would've gone to waste, so I stepped in.
Edit: Found my post about first vaccine reaction:
https://texags.com/forums/84/topics/3170725/replies/58335866