Hi Twinkletoes,
Hyperfocus on areas of interest and general need for massive stimulation could be ADHD, predominantly impulsive type. Or, as you note, giftedness.
If all this is intrusive on daily functioning and happiness (sounds like it is...) then you might want to get an evaluation by a developmental pediatrician or a neuropsych.
FWIW, in our family's experience, OTs tend to overattribute to sensory issues things that may or may not be sensory in origin. We have never had success in approaching things from that angle.
HTH,
DeeDee
