i don't know if your feeling will return or not but many times these severed nerves will eventually reattach and your feeling will return. this can take a month or more. in my own case with a similar injury my finger remained "numb" for years. now i have partial feeling. unfortunately unless the medical provider reattaches a severed nerve you are at the mercy of your body's healing ability.
laceration to distal portion of index finger. 6 stitches. injured a month ago. no feeling in finger tip. will it return?