I am getting disrespectful lately to authority figures just do not like?

being patronised and i was fined 200 pounds for my son being late for school, i get depressed and cannot sleep well and wake up late and although trying to improve this, he,s only 15 mins late i have my grandkids living wiht me and we get really short sometimes, we run out of milk and that on sundays and its a realy job to manage and these people have made it worse and i get real angry, what should i do