Hey @DC
It's good that you've noticed that your distress is stemming from your own thought patterns. That's often true. The way we frame things in our mind can have a great impact on the way we feel and cope with things. I must also say that it's really great that you are reaching out.
Watching your parents go through a divorce would've been tough, and it makes sense that you have been negatively impacted by it. I believe that is quite common. It must've been hard to live with someone (I assume) you don't really know that well, especially if you don't get along (or do you?). Was it your dad or his partner, or both, who accused you of stealing and lying? Either way, being accused of something you didn't do is not fun, and the symptoms you are experiencing sound unpleasant.
I personally think it might be really good for you to get in contact with free counselling services such as Kids Helpline who operate 24/7, e-headpsace, or Lifeline. I also recommend you browse through our list of self-help apps. Some of them may be of use to you.