You will never feel worse than you do right now, if you immediately start doing the things you already know you have to do. Said another way, it will get better immediately, if you make the changes right now. Otherwise, you will feel worse tomorrow.

Even if you are tired, lace up your gym shoes before you get out of the car and take the dog for a 5 minute walk. Once you are out with her, after 5 minutes...you will feel like doing 10 or 15. At work, since you are on your feet all day, find a big couch to hide behind and do 10 lunges, or squats, or heel raises (for your PF). Heck, go into the back room and do 10 sit ups every hour (he he he...your co-workers will think you are crazy).

For the eating, keep it out of the house, and remember that once you adopt a cleaner eating style, in a week, it will become that new habit for you.