I think you should definitely hook up with other moms in your area and get a play group going! You definitely need a time away from home that you can look forward to!
Some cities have kid-friendly places (NOT mcdonalds) where moms can hang out with their kids, and they have a separate baby area so they don't get trampled.
Ever thought about getting out to one of those with a friend or two? If anything else, just being able to vent about your day with another woman can do WONDERS on your mental health.