Hello and welcome.
I do not live there, but I looked up "autism treatments in boston mass" and found this:
Spectrum Autism Treatment Center - Mental Health Clinic
380 Elm St, North Attleboro, MA 02760
Cross Streets: Between Mt Hope St and Bulfinch St
(774) 643-6477
I know you said "independent doctor", but this may be a starting point.
Good luck. ![Smile :)](./images/smilies/icon_smile.gif)
_________________
The existence of the leader who is wise
is barely known to those he leads.
He acts without unnecessary speech,
so that the people say,
'It happened of its own accord.' -Tao Te Ching, Verse 17