First, you're not whining- you're being honest about how you are feeling.
Second, sometimes you have to change your behaviors to change your mindset. Essentially, you know that getting out of the house will help, but you just can't get yourself to do it... feels too overwhelming. Start small and go for a walk. I know it's freezing, but 10 mintues in the fresh air will make you feel a little refreshed. "Schedule" it each day and do it- whether you want to or not and eventually it will start to be something you look forward to.
Third, housework- make a list of what needs to get done "daily" "weekly" and "monthly". You may be surprised by how little is actually a "daily task"- laundry, dishes, make the beds, dinner, bathing.
One of the "hallmarks" of depression involves feeling overwhelmed by the most mundane and simple tasks. It seems like too much and you get discouraged before you start, so why bother! I'm a behaviorist, so I would say- "start and see what happens", "make things concrete, set a reasonable goal for the day", "change your behaviors and your mindset will change soon enough".
Start small and see how you feel!
** There are some anti-depressants that are considered "safe" during pregnancy. I'm not advocating meds, but if you are feeling like your children are not being cared-for the way you would like them to be, talk to your doctor and see!**