We can't motivate you for you. That's where YOU have to take the ball and run with it. Big thing is to not beat yourself up for the mis-steps. They happen, it's what you chose to do next that matters.
Missing going to the gym? Well, GO! Stop making excuses and go.
Not following your diet? Well, Stop it! Start following your diet and stop making excuses.
Push yourself! No one else is going to make you feel horrible because you ate crap and aren't doing what you know you are supposed to do. No one else is going to look back at you in the mirror and be disappointed because you didn't do what you knew you should have. Just do it.
You know you have to,
You know why you have to,
The ONLY way to get past feeling the way you do... is to do what you know you are supposed to.
So stop dwelling on the crap that happened yesterday, focus on what you need to do to be successful TODAY.