Extremely emotional, angry and grumpy 8 year old boy

[Gemsquash87]

Over the recent days my 8 year old boy has been over emotional as well as obnoxious and angry. He is generally a lovely boy, but does struggle a bit with his emotions, but nothing as bad as it has been in recent days. Could someone please help me understand what he is going through and any advice and tips. Thank you.

Have you asked him if there is anything behind it? Had he had any issues at school - bullying, falling out with friends?
My 8 year old is also quite emotional, I find his behaviours and attitude are noticeably worse if he's too tired (e.g. towards the end of school term when there is a lot going on) or if he's anxious about something (even something he's looking forward to can also cause some anxiety).