So I wake up yesterday (Tuesday) with this super tight feeling in my back. It's basically my lower lat on my right (opposite of my heart, might be left in anatomy class, who knows) side. I'd say it's about where the abs meet the chest height on the back. Basically, it's really tight and when i move my abdomen it feels like I'm stretching it farther than I can go. I also get spasms sometimes. I've started icing it today because when I woke up it felt a little more strained this morning. I've never had this before and I just figured it would go away yesterday. Any suggestions?

The only thing I can think of is that I sat awkwardly in one of my chairs for a major part of Monday reading. Might have stretched it out too much and strained it.