P.B.
Mothers of Multiples has a HUGE organization - maybe they've got something near you. I organized a playgroup in our neighborhood - just by getting out and walking you meet others who have small children - take the time to get to know those close to you and START a playgroup if none exists. Then you can start a babysitting co-op so you can have a few hours once a week to go to an appointment, shopping or lunch with an adult.