Question for all the single moms out there!

First of all, I am 19 and 16 weeks pregnant. I have been married for almost a year and I love my baby more than anything. My husband is a drug addict. (Weed, painkillers and cigarettes) We have been having a lot of trouble and he left me three days ago. I am currently at my parents house and I feel completly lost.

So my question is, how did you do it? How were you able to put aside all your feeling to give your baby the best life you could? What should I do now?