Ashwagandha is a herbal product which is known to have anti-anxiety properties.
But it's research in treatment of clinical anxiety is still not conclusive.
Recently there have been reports of cardiac side effects of long term ashwagandha and brahmi use. But whether these side effects are a result of these herbal drugs or not is not conclusively proven.
Next Steps
Avoid using products whose efficacy is not yet proven.
Your current regime of modern medicines is robust and there are enough options in modern medicine to give you good relief for your brain related concerns.
Trust your psychiatrist.
Health Tips
Always avoid mixing two systems of medicine