Question one: As far as I understood what the Dr. told me, your bleeding stopping quickly is normal and good.
Question 2: I think as long as you arent on any medications, it is ok to have a drink...
Question 3: It totally varies for everyone. Some women and couples are scared from the moment they find they are pregnant until the moment they deilver even if they have never had a miscarriage, and others miscarry and become pregnant again and are able to adjust into the pregnancy without too much fear. If you feel that getting pregnant again will mess with you emotionally and you need time to heal from this loss, take the time. If you feel ready to jump in again, go for it. You may feel stressed about pregnancy loss, but you will feel stressed about your children every day of their life long after you deilver ;)
Im sorry for your loss and understand the grief. Dont give up...most women go on to have healthy babies after a miscarriage