OK, so first thing first: You're not alone. I am in the same boat with the DAT. I am postponing it until mid-October because my daughter is due 2nd week of September. I worry because I have about 9 weeks to get strong on this material and so far I have been treading water. I can completely relate to where you are coming from.
The most basic piece of advice I can give you is don't make this into a catastrophe. Let's say that you don't get the AA score you were hoping for in October- You have the option to take it again in 90 days. If I don't get the AA I need then at the end of January I will be doing this again. It's not the end of the world. Sometime little details don't fall precisely into place, you have to adapt and overcome. The DAT is not a hard test. It's rote memorization. Time & effort in = upward trends in score. How much time and energy it takes to get X score depends on the person, but the more you study the better your score will be. Keep going until you get where you need to be based on your GPA.
Piece of advice #2: Cardio. I don't know what your fitness level is, but instead of yoga do something cardio that will release endorphins. You don't have to be a runner to get the dopamine drop. Go jump on an eliptical or treadmill and get your heart rate up for 45 minutes. When I am not pregnant I run ALL THE TIME because the endorphins help me to not murder my god awful sociopath coworkers.
Piece of advice #3: Get a massage, drink a beer or a glass of wine. I didn't say go on a bender mind you. If a drink helps take the edge off then do that.
Piece of acvice #4: Zanax or anti-anxiety medication. Not a popular suggestion and I am sure that someone will jump in and have a contradicting piece of advice. Talk to your doctor, but if this life event is causing you so much anxiety that you are having trouble managing a daily activity like studying then it is appropriate to at least consider medications. Let me revisit the subject of my two sociopath coworkers. Can I deal with them without resorting to medication? Yes, absolutely. However, a very low dose of prozac (10 mg) makes my life much easier because I am not giving myself an ulcer every morning worrying whether today is the day that one of these ladies will have another hysterical temper tantrum because someone called her a secretary instead of an executive assistant, or whatever. The lessened apprehension allows me to focus my energy on other tasks and makes me more productive.