I agree. This is a pretty big adjustment, so give it some time. I felt like we'd made a mistake in the first few weeks, too. Then, the thought hit me again after six months. I still wonder occasionally, but things have worked out after we got into a routine. We got to know what's going on in the community during regular daylight hours, got involved in some playgroups and activities, etc.
How old are your kids? Maybe we can help you figure out a routine.
Wow! What a big change! First of all, give yourself some credit. You are going through a major adjustment period. That along with having 2 kids will account for feeling overwhelmed and tired! As for the routine thing, I find that it helps if I write out a schedule for my day or week. I used to be a teacher, so I'm used to writing out plans. After a few weeks of that, our routine felt more natural. Don't put too much pressure on yourself. :)
How old are your kids? Maybe we can help you figure out a routine.
Manda :)