Index finger injury. Some help plz?

For the past month or so my index finger has been getting worse and worse, and the more i play the worse it feels almost to the point where i cannot ever grip the racquet. It feels almost as if i sprained my finger but i havent. The pain is the worst on the top knuckle of my index finger. if you could provide any help at all that would be greatly appreciated! thanks!

here are some of the things i think may be causing it:
switched to babolat pure drive about 2 months ago
use bb alu power
recently started using two overgrips over my original grip
i now grip the racquet much lower on the handle and not as tight

let me know if any of these could be causing it. thanks
 
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