I think I'd find an internist to help you. More bloodwork, some investigatory figuring for you.
If it turns out there is nothing else, I'd consider post-partum depression.
Did you feel this bad before the BC pills? If there is a chance that the BC pills could be the culprit, ask to try a different kind, or drop them all together. Ask the doctor about Mircette - I had a good experience with it. It didn't drop me off the estrogen cliff on week 4.
Ask your doctor about taking daily vitamin D rather than weekly vitamin D. And look into having vitamin supplements you EAT (or drink) rather than taking them in a pill. (Herbalife is a very good way to do this.)
In the morning, you need a high dose of protein. Eat an omelet of one full egg and 2 egg whites (you can buy egg whites by themselves if you'd like.) Lowfat string cheese is also great, especially for a snack, and Chobani yogurt (greek yogurt) is too. (Look at the label - the protein mgs vary greatly - I get the vanilla flavor that has 19 - 20 grams of protein per serving.)
The reason you want a good shot of protein in the morning is because it helps your liver not work so hard. And the protein will give you energy without spiking your blood sugar up high. Say you eat a sweet roll - your blood sugar goes really high, giving you energy. But then it comes down hard, and you get tired and crave more sugar. Instead, do your pancrease a favor and don't make it work so hard to produce insulin. If you get the protein, eat a small fruit and some string cheese as a snack in the morning, then a decent lunch, and some high protein yogurt for an afternoon snack, plus some prunes for helping you keep regular, your bood sugar "wave" looks like gentle waves rather than huge up and down spikes.
The other thing to do is to drink water all day long. If you weigh, say, 150 pounds, you should be getting half of that in ounces of water per day. Most people are continually dehydrated, and that makes it hard to get all the toxins out of our bodies that need to be flushed out, including water weight. You'll have to pee a whole lot the first week, but after you get all that stuff flushed out of your system, you won't have to go as much, and you will start feeling better.
Try these things before going to the doctor. They can't hurt. They CAN help. And that's what you're after.
Good luck!
Dawn