So I'm skinny fat now? Great. How do I fix it??

Hello :)

I used to be underweight and decided to pack on the pounds, but I lead a pretty sedentary lifestyle right no and am subject to frequent binge episodes of around 4000 calories comprised mainly of unhealthy nutrient-deficiet foods. This is not how I wanted to gain weight. But there you go.

Thing is, the scale still says I am underweigt because the number is low, but due to the fact that everything I have gained is fat and absolutely no muscle (due to the bingeing my diet has very little protein, also I don't exercise at all). 

Wht do you guys recommend I do now to tone up and actually have a nice body? Because Ok, dressed I look fine. But naked... not nice.

Please take into account that I cannot work out as I am going to be very busy for the next 2 months. If anyone recommends sit ups or something like that, please give me a routine/plan to follow. I ave tried to do so (before when I was actually fit and did sport I could do 250 sit ups at a time), but now due to the bloated stomach from the overindulging I find myself uncapable of doing so. 

Have I completely screwed up my body? Is there any way at all to fix this? I just want to be healthy. That's all. Thank you.

if you're still underweight then you need to focus on getting your weight within a healthy range before worrying about your body composition. when you gain weight and it is healthy for you to exercise i would recommend strength training. depending on how underweight you are it might be okay for you to invest in a set of dumbbells and do various arm exercises, lunges, squats, and abdominal exercises. what are your stats?