Hi
@Bxox , welcome to the forum.
You are definitely not overreacting, this is absolute unacceptable behaviour from your manager.
You might want to contact HR about this, but I don't know much about the rules in your country. Let me tag
@KennyA , he may have some ideas on how to prevent a situation like this from happening again in the future.
A hypo is a medical emergency which needs to be treated right away. Having you walk to the shop for treatment while you were already at 2.6 could have easily ended in an ambulance.
I hope you feel better now too!