You guys I am freaking out. TW for weight issues.

I've gained 10 pounds since I started taking Lexapro, two months ago. I had no idea. I knew that I'd put on weight, but seeing the number really jarred me. I don't know what possessed me to weigh myself at that exact moment (especially the day after Christmas) but HOLY SHIT. What the hell happened? How did this happen without my noticing? I am a pretty small person so 10 pounds should be pretty fucking obvious.

What do I do about it?