Here's a list of support groups for moms in Lewisville & Flower Mound:
http://familyeguide.com/Support-Groups.html
Some, like DFW Area Moms, offer online support. But you can always introduce yourself like you did here and see if there are people in your area to set up a playdate with.
Other groups on the list, such as MOMS Club, might offer a chapter in the Lake Dallas area as well. You can either do a search of their corporate site, or you can contact one of the LV Locations.
Although some of these groups aren't free, their annual dues are generally very reasonable ($20-30 a year), and they offer lots of free activities throughout the year like playgroups, playdates at local parks, etc.
Good Luck!
www.familyeguide.com
Your free guide to local family activities.