What Causes Itching,pain And Redness After Dying My Hair?

Hi im 18 years of age and my friend died my hair 24 hours ago. She did this with bleach and continued with this 4 times in a row. each time the bleach was on my head i felt icthing but no burning. 24 hours later i now have a red scalp with raised bumps plus a rash. the pain is about 6 out of 10 but is burning alot ? What is happening to my head as this is causing my my eyes to water to ?