From my understanding, holy basil is supposed to have some anti-stress properties but in Ayurveda I believe it is most often used as an anti-viral/anti-bacterial and not as a means to re-balance the body. Holy basil will reduce vata and pitta but if over-used can increase pitta. Valerian root is not normally used in ayurveda because of the possible side effects, valerian requires a healthy liver to process and eliminate otherwise it will stay in the body for a very long time. Ashwaghanda can help to decrease vata and also increases pitta. The best way to know which herbs are best for you is to go to a qualified ayurvedic practitioner so you can get an exact picture of what is happening inside your body and which herbs will be the most helpful for you.