Using another person's deck

Hi, im new to Tarot (just picked up my deck e days ago) and yesterday my friends and I were hanging out when my older friend who has been into Tarot longer than I have asks if I want to try using her deck to practice my own readings, (since I had left my deck at home). Both her and I agreed that after 4-5 readings we felt a weird sensation, my head started to hurt while doing the readings, and she said she had a similar experience. Does anybody think they could provide some insight into our situation?