Consistent back pain after riding...Help!

What up, I was ridint at the beginning of this season (early april), and rode in the am w/o stretching and pulled a muscle in my back (according to the Dr.), they gave me motrin and vicodin and told me to relax and stay off the board for a couple weeks.

Now I work as a mechanic, and it doesnt really bother me during the week, and I workout and still nothing, but now after a day of riding the next day I damn near cant walk. I have been religious about stretching too before I ride, nor am i going super big or crashing hard. Matter of fact I rode switch pretty much my whole session yesterday, so it was pretty much just some light riding and minor jumps.

What Im wondering is anyone else having this problem? I know im not 21 anymore, but im also not in bad shape. Maybe i need a second opinion? Im just getting frustrated and I dont want to be sidelined all season. Thanks !