Certainly reducing your alcohol intake and stopping smoking will help, too. Remember to start taking folic acid to help normal development of the baby's nervous system. Reaction to a miscarriage is very variable and once again there's no 'right' way to feel - a range of reactions are possible and normal. In addition to the grief you may feel, your body will be undergoing some profound hormonal adjustments, which may make you feel very emotionally volatile. Grief is a very normal reaction to the loss you have experienced and it may be as intense as that after any other loss.
Many women describe a feeling of numbness and emptiness following a miscarriage.
Some couples withdraw, feeling alone and isolated, others may wish to talk about their loss. Men often feel they have to be strong for their partner and find their loss particularly difficult to talk about. Although its is difficult at first, it may help to try and tell family or close friends how you feel. Bookshops such as WH Smith or Dillons stock books on pregnancy and many of these contain some information on miscarriage and optimising health for future pregnancies. Your GP may be able to give some more specific advice.