Don't be so hard on yourself. Your body on the outside may be back on track, but hormones are another story. It can be up to a year or more before those stabilize in some people.
Besides, if you consider the possibility of hormone imbalance combined with the fact that you're raising two little ones (who are both still very dependent on you), plus a FT job, AND a husband (who may be really dependent on you too)you're dealing with alot.
Give yourself time to recoop. Unless your husband is actually saying something to you, don't invite trouble. All you will be doing is putting unnecessary doubt and pressure on yourself. At all costs avoid acquiring supermom syndrome. You will burn yourself out.
To help you feel better, talk with your husband about your fears and concerns. Be honest. You might be surprised to find out, he's feeling stress too. They (men) go through similar stuff after having a baby too. They just don't usually talk about it. Hopefully, he is understanding and patient enough to work through it with you. I like the idea of a weekend get away for just the two of you. It sounds like you are due for a real vacation, and you definitely deserve one. Perhaps some R&R, away from the kids and work will be the answer.
As for the hormone question. If you think this is a possible cause of your current issue, perhaps talk to your OB/Gyn about it. There are tests they can do to see if your hormone levels are okay. If there is serious enough of an imbalance, they might be able to prescribe synthetic or natural hormones to get you back on track. They could also check to see if this is a result of post-partum depression Don't worry! not all PPD is the severe kind you hear about on the news. Some people just suffer mild PPD, and often a common symtom is loss of libido and/or exhaustion too. Likewise, there are some things doctors prescribe for that too.