It took me awhile to get back into the rigth mindset of diet changes/exercise again. I likewise was off my plan for a while since last xmas!! I had a blast visiting my family and going on vacation but Now it was about time to get back to it.
Grrr it was difficult the first days, my advice is to start with baby steps. My mistake was to do drastic changes to my diet/routine that didnt go to well cause i was still not in the rigth mood/mindset after that failed I took it easy and I started going back for my walks that i enjoy, then it turned into jogging.
Exercise has to be something you like/enjoy or else it will be dreadful/boring!
I started cutting back cal as well (but not too drastic) and tracking what i eat with mfp app. I still allow myself some cookies/dark chocolate/bagel/(____)<---insert something here that i crave/ but within my cal allowance, doing so i dont feel like its a struggle/stressful to eat on plan or an urge to overeat from too much restriction. It works for me. I started a post on the main section tracking my progress and inviting other gurls to track theirs, u r welcome to join!
Good luck! And you can do this!