Talk to Dietitian/Nutritionist on Over Weight And Diet Issues

I'm a computer science student so the majority of the time, i spent is in front of the screen. In recent months, I've been working on my research so i couldn't get enough time to go outside or do regular exercise. For the last 3-4 months, I've gained almost 12-14 KG and now it is 92 KG and i can feel it. I don't have any diet routine, sometimes i get up and do Breakfast at 10AM and sometimes i do breakfast at 12PM.. and lunch after a few hours.. and dinner after 10PM usually.. I've no control or a diet plan.. i just eat when i get time from my research.. also I've been eating dry fruits during these few months.. Now my research will still take 2-3 more months.. and I've to spend my time at home, and i rarely get enough time for exercise.. though i go for a walk for 20-30 minutes daily,, but i feel it's getting bad now.. I want to change my diet routine, and also want to lose the weight which i gained recently.. I'm also having neck pain from quite long bur due to over weight, it's also