Low battery by 4pm

Yep, look at the quality of food you are eating. Look to add more fresh fruits and veggies if you are lacking those.

Also try to eat smaller meals more often through out the day, not just 3 large meals. When I changed this in my diet, made a world of difference for me.

I like to drink really cold ice water in the afternoon.  Seems to keep my battery charged (or at least going to the bathroom often).

I bet the prego piece of the puzzel is adding more to your day than you are giving credit for. 

My typical day's eating consists of:

Breakfast: Big bowl of raisin bran with milk, 2 eggs, cup of half-caff

Snack: Banana slices on toast

Lunch: Cup of yogurt, cup of strawberries, half-cup of blueberries, half-cup of granola, celery with peanut butter, 12-16 tortilla chips, trail mix

Snack: Apple and trail mix, 2 fig newtons

Dinner: 6-10 oz portion of chicken or fish or meat, 1.5 cups cooked vegetables, 1.5 cups cooked wild rice or couscous

I drink water through the day, but not enough I think.

Have you had yourself checked out medically?  I only ask because some of your symptoms (low energy especially) could be due to the onset of anemia (low Fe in your blood), which is especially common in pregnant women.  I suffered with this for 2 years, and all it's complications, before it was diagnosed correctly.  I now take a high-dose iron tablet every day, and I have no more energy problems. 

Like you, I still can't sleep well, but's that's something that I've suffered from all my adult life, probably making up for all those years I slept non-stop as a teenager??!

sounds like the problem is likely your lack of sleep.  Few people can get along well on that little sleep for more than a couple days.  There are doctors who are board certified in sleep medicine.  Might be a good idea to see one.

No.  You don't need a special recovery drink after just a 5K jog.  With your regular every other day running schedule- your 'fitness level' jogs are not depleting you such that you need to enhance your muscle recovery.  Unless you're running them all at 'race pace' going all out, and wanting to increase your training load every week.

I am a 6-hour per night sleeper.  No  matter what time I go to bed, 6 hours later my eyes automatically open.  Once in a while, I can sleep for 7, or even catch a little nap, especially if I'm in heavy training.

I can tell you that when I get tired at all, it's usually related to my diet and too many bad carbs or sugar.  I could not live on the little that you eat.  Your lunch makes me hungry just reading about it.  BTW, I weigh 110 lbs. 

I do very little starch (potatoes, rice, tortillas, pasta, bread).  Too much of that makes me really tired.  I snack constantly in between meals.  My snacks include cottage cheese, apples with almond butter, almost any kind of fruit, a pbj sandwich, a can of tuna, hard-boiled eggs.  I eat a lot of eggs.  Eggs with pasta sauce and ricotta cheese, omelets with veggies, etc.  I feed my sweet tooth with fruit and sometimes honey.  I eat lots of salads with avocado and olive oil and balsalmic vinegar, and lots of almonds and cashews.  Between meals and snacks, I'm probably eating 7 or 8 times a day.

I make sure not to eat later than 8 pm and stay upright for at least two hours before reclining or sleeping.

This is what works for me.  Hope it helps.

I agree with morey and I also have a hard time getting enough sleep. I wake up at 5:00 a.m. and I've already been fussing around trying to get back to sleep usually since 4:30, 4:00, 3:30....

So yes, by 4:00 or 5:00 in the evening I'm just tired. I have changed my diet some lately due to an article I read while at the coffee shop . Heh, heh, I think that's ironic to read an article about sleeping better at the coffee shop. Anyway, I don't remember everything but 3 things were: no caffeine after 11:00, no sweets before bed/in the evening, eat whatever lean protein you are going to have with lunch and eat a light dinner. There were a whole bunch of reasons this all made perfect sense in the article but I really don't remember everything.

http://www.fitnessmagazine.com/health/spirit/get-to-sleep-guide/what-to-eat-for-better-sleep/?page=2

This is not the same article but it is saying a lot of the same things. Sorry it does not look like the link is going to work.