My chiropractor, Tim Knight, is very gentle and *very* good (he's been practicing for 25 years now). Quickest way to get to him is to take the 77 (or 79 if coming from alewife) to the second-to-last stop in arlington, walk down park ave and take the sharper right at the crazy intersection. I can give you his number, if you like, and I think he has a website somewhere too.