Help me make a decision

I a working for a project, my client is super toxic. Even though work is not that much its difficult to work with her. In terms of learning there is no learning. My mental health is going low day by day. All time i feel anxious and feel like crying.i am not able to study as well to prepare for other companies. I dont know if i should resign and find a job during notice period. Please suggest, moreover i dont have any financial dependency.