Some techniques - stop studying and got for a walk, or take a hot shower, or brew some tea, wait until it cools down, and drink it, or write your thoughts in your diary (since you have a diary, this technique must help you for sure), or do a review (when you are feeling the ANTS, it is much harder to learn new material, but you may still be able to review old flashcards, and then you will still feel that you have accomplished something, since reviewing old material is vital for academic success). Doing something active, such as a few exercises with dumbbells (I wish I did what I preach ) would help, too. I am not sure about mantras, but either falling back on the option of reviewing old material or doing something physical should provide relief.

Of course, you can draw a picture of your dad and burn it, but make sure you do so in the sink, for safety reasons.