Hi,
although you should do your best- I think it's pretty common in the first few months to not feel like eating- my friend's mother had morning sickness with all three of her children, right up until the day she gave birth - all three times !!!!
The only thing she could keep down was lemonade flavoured icypoles (i think called ice lollies outside australia! In ireland, we called them icepops.) well anyway, i'm sure you know what I mean, and that's pretty much all the poor woman could eat for her whole last pregnancy. Needless to say she didn't gain any weight.
All of her children were healthy babies, and healthy adults, and one is almost a doctor, so it didn't do them any harm at all.
The baby will take what it needs first, and you get what's left over. Just eat as much as you feel like, any time you feel like eating, take your vitamins, and it'll be fine.
As for the aniversery of your loss, that must be really sad for you. Maybe rub your tummy, and think the of the new life inside you and how maybe he or she will carry the spirt of their lost brother or sister with them - to look over him or her for you.
Take care of yourself.