I went for my second week 8 run today - I completed it but found it extremely difficult. I completed over 5 minutes of cool down; however, when I was walking for the cool down I was swaying and felt dizzy. Once I got home, I collapsed (couldn’t walk, stand, lift my head up and apparently my eyes were rolling to the back of my head). This was then followed by vomiting. I am unable to recall the actual run itself and have no idea where I ran, and I am unable to recall everything that happened when I got home. I was unable to walk and had vertigo and confusion for up to an hour after this run.
I ate porridge around an hour before the run and have had plenty to drink. Does anyone know what happened/have any tips on preventing this from happening again?