Pilot test?

Yesterday I took the pilot test for the first time with some friends.

For those who don't know what a pilot test is: It's a test of courage you do among friends. In this test, one person has to kneel down and breathe in and out deeply and quickly using only their mouth until their throat is dry. Once their throat is dry, they have to stand up, hold their breath, and have a second person hold them against a wall. After about five seconds, the person holding their arms should faint from lack of oxygen.

I did it three times in a row, which was obviously very stupid and dangerous of me, as I fainted for about five seconds each time, etc.

This morning, I noticed that the area on my chest where the pressure was applied was very painful. I also feel very dizzy, and my vision is blurry. I also feel very tired and weak. What should I do? Would a painkiller be enough to help me? Or should I just wait?