I had the exact same experience around 4 weeks post cesarean, it’s gone away now though at 8 weeks. I think nerves coming back and being more mobile is what caused it for me x
Yes, lower down aches and pains are normal. I also had a few months where I would get a night or two of painful nausea, which we never found the reason why, but it passed. I also found that I couldn't do pants that compressed my stomach, like jeans, for a good long while (like 3-4 months), then I decided fuck 'em. 😂 I feel fine but now I just live in leggings.
It's quite normal don't worry it will pass I had that too.
I think it’s your nerves coming back! All the nerve endings are cut during the c section! Take it really easy!! Even if u feel good still rest think u just over did it