Did it again.

What is this? Is it a typhoon? Still raining.
Yesterday, I okayed the contract terms with the house builder. Now the three-quarter-year house-building project has finally started. It's going to be a long and tough job for everyone of us. I quickly began to throw away books I no longer need by buying cardboard boxes at the on-line Bookoff shop. The shop started an on-line purchase service for used books. The boxes arrived yesterday and I put books into them to send them back to the shop. (They will send a delivery service truck on this Saturday.) When the box was filled 90 %, it was much heavier than I thought. Just as I lifted one of the boxes, I felt something wrong in my back. I did it again. This morning when I got up, I found it hard to sit up on the bed because of the pain. It got worse. Good thing is, after I managed to stand on the floor, it's not terrible. I can walk though I can't sit for a long time. Hope it will get better anytime soon.