Is this a mental illness?!

Is this a mental illness?

i have a friend who is delusional. interprets things in such a way that other's wouldn't be able to understand. he feels like everyone is going against him. his job is out to fire him and his school is out to make him unsuccessful. he gets depressed and thinks worse case scenarios and has anxiety attacks. an extreme "what if" person. he also is very impulsive. he does things that he completely regrets after and he puts himself under more stress. also, at times, he can be so happy and quite anxious about life and he drives fast when we go out and does crazy stunts as well. sometimes, it gets to the point where he can't sit still, talks fast and i can't understand him. it's like he's an emotional wreck. he says something is wrong with him, he's not himself and i definitely recognize it too. could he have a mental illness?

3 weeks ago
also, he is NOT on drugs.

like....duh!!! he should see a psychiatrist as soon as possible before he hurts or kills himself or someone else.