Good Morning,
Dont worry I am in somewhat of the same situation. However, I also would like to say that a friend once told me when you are happy and just enjoying life you may also tend to pick up weight. I know that when my husband and me are doing great and life seems perfect I tend to pick up some weight, because I am just enjoying life. Dont be harder on yourself nothing is wrong with you. We all just need to learn to discipline ourselves on healthy habits. Just remember NOTHING IS WRONG WITH YOU.
You may be eating very unhealthy foods as well, because of what you see your husband eat. You say you still 'try' to eat healthy; does that mean you end up also eating a lot of unhealthy stuff? the little things can add up- that little butter, extra red meat, more processed food etc. One way would be to maintain a food diary and note every little thing that you eat - even a morsel. This will give u an idea of what you're eating overall, in a day. Do this for a week.
Since you're still newly married, it may take a while for you to get back to your own healthy habits, but like paxiled said, you need to go back there, hubby or no hubby :)
The first question is, you mention you're still eating your healthy foods but has your diet changed a lot? If it has, then you need to go back to what you were doing before, hubby or no hubby. Let him eat what he wants and you eat what you need. If you've stopped exercising, then that's an issue. If nothing has changed and you're still eating basically what you were before and exercising the same, then it might be something to check out with your doctor -- it could be thyroid or something else.