I've been in the same boat. I was launching rocks across a driveway with a square shovel 5 years ago and have suffered since. I would go for x-rays.. nothing wrong with that. Also, do you have a girlfriend?
Your muscles are probably very tense from studying and whatever. Next I would go for a massage. A lot of times it's tense muscles actually pulling on your discs causing pain. A massage therapist also told me a trick - grab a tennis ball and roll up and down close to the spine on your back. Funny but it works awesome for me. I don't use a tennis ball but that is what was recommended.