Feeling drained after tarot sessions

Does anyone else feels drained after doing tarot readings for too long? I’ve been doing around 20 to 30 questions each session for my family and after that I feel so tired it’s hard to even move my tongue to speak. I’ve got my first deck thinking it would be easier than regular divination, but it seems like it’s just difficult in a different way. Each time the cards give correct answers, but when I have no energy left, it can be tricky to see the right interpretation if the answer is not completely straightforward. Am I doing something wrong?