Can't move all of a sudden

I don't know if I've overdone it or something is wrong but I had a burst of energy today and cleaned the entire house, did laundry, cooked, had my toddler as well and just was constantly on the move today. Now I've done this before with no issues earlier in pregnancy. The problem is I'm now unable to move without being in pain. I've had PGP for weeks but this is something else. As soon as I sat down my backs had horrible pains. My hands and feet look slightly swollen. And now I'm in bed I literally can't even turn over. I've tried stretching. Rocking back and forth. Taken paracetamol. The pains keeping me up. Have I just overdone it or could this be a sign of something wrong? (I'm 36 weeks).