I had 2 miscarriages in past 6 months. What should I do now?

I am almost 34. I had 2 miscarriages in the last 6 months. However, both times it happened after i had large parties in my apartment. I think i did too much strenuous jobs and was very much excited during that period. My Dr told me that I have no abnormalities and both of the accidents happened due to some problem in the fetus itself. My husband is a smoker. I wonder is it related to my miscarriages. Is a healthy diet plan can reduce the chance of miscarriage? Is it true that miscarriages continue if I don't wait 6 months to conceive again. I would really appreciate your personal experiences and replies. Thanks