Help getting back on track.

I was doing SO good with keeping under my calories and working out 5 days a week. I lost ten pounds and 2 or 3 clothing sizes a 40 to a 34 in guys, a 13 to and 11 in girls(I think, I dont really understand girls sizes).
then my mom got thyroid cancer, it took a toll on me.. she's had 2 surgeries and I was living off of hospital food and fast food. so I gained 3 pounds back and barely fit in my new clothes, I also stopped taking my vitamins. I'm trying to get back on track but I'm hungry ALL the time and tired ALL the time(I'm guessing because I dont take vitamins). It's hard to get myself to work out and I always want to eat. I still eat healthy foods, just tons of it. I don't know how to get myself motivated again... I dont know if anyone's gonna read this, but if so any suggestions??? thanks guys.