Can this be my muscle it's so much pain..?

It's been about 3years since I ve went out and played basketball.well for about 5 days now I've been playing basketball I've been sore,of course I knew I would be! Well yesterday well I was playing I went up for a rebound and then I started getting a shape pain in my lower right back under my bibs and going to the front right side,I can't even get out of bet it's so much pain and it's makes me stiffen up and hard to breath at times is this serious or is it muscle related what should I do I'm concerned never experienced so much pain before plz help thanks..