When pregnant, my MIL supplied me with METAGENICS vitamins. Granted, they were 10 pills a day (annoying!!!). Not sure if they have a one-pill multivitamin or not, but my MIL swears by Metagenics so much that she sells it now! (but she's in California).
Tired during the day - are you drinking a lot of sodas? Fast food? Try a couple of weeks of WATER WATER WATER and see how you feel. Also, I used to drink a soda each day, more for the regularity of it, the taste, the craving. I've just recently gone down to two a week and I've been drinking water instead. I feel so much more energetic! And I haven't completely taken them out of my diet yet because I keep getting headaches when I don't drink them (get them after no sodas for 3 or 4 days). So not sure if that could be related to your headaches or fatigue, but looking at your diet and making a few changes could help.