I need your advice? (Long post)

I've been married for three years and if you met me on the street I would smile and say it's great, marriage is amazing. Don't get me wrong I love my husband and he IS amazing but there are so many things I am unsure of and it's slowly killing how i feel about this marriage. 
​So to start, we both work full time jobs, I'm a teacher so of course I don't get a great pay check, he is in IT and earns a decent salary. We were young and stupid and ended up getting into a lot of debt that we are now paying off and it literally feels like that's where all out money is going, we only have ourselves to blame. And as of late hubby has been going for drinks after work and wanting us to go out every weekend and has been drinking until he is drunk. And we have been having the same argument since December 2013 about his smoking habits. We have planned to ttc starting April 2015, I have seen my dr and have been prescribed a multivitamin and trying to watch what I eat and get a bit of excersise in each day and just doing little bits here and there but I feel like it's all one sided and maybe he doesn't want this as much as I do, but when I ask he just says we will see how we feel in April. It's really bringing me down and i feel like it's all really affecting out marriage and I love him with all my heart but have no idea where to go from here?