What could be causing the pain in my index finger? Can it be life-threatening?

I am 27, 5' 7" tall, overweight by a bit (have Hypothyroidism but on corrective meds and working out everyday trying to get the weight off/eating correctly), have back pain (after walking 100 yards because of the keg in the front and a tiny roll on my back), I am in front of a computer (employment) anywhere from 8 - 13 hours a day, and I have had this horrible pain in my right index finger for about 7 days, now. It hurts like crud when I try to play video games or when I do something as simple as clicking the left on my mouse. I did see a doctor on Friday (when I realized this was definitely serious) and she prescribed me Etodolac (which only dulls the pain by maybe 40%, and told me to get in a wrist splint. I have been popping all my fingers, my elbow, and my shoulder... nothing. The wrist splint helps me not wake up in the morning screaming when blood tries to rush into my hand . . . but it's been like this for 7 days. I've read where it could be my weight (I gained 27 lbs. in 2 months .. only been working out daily for the last 11 days) or it could be CTS ....is there anything else it could be? And could this be life-threatening or could I start to have damage in my finger over time? I am thinking about seeing an orthopedic specialist. HELP SAVE MY HAND. *lol* thanks!