My older brother is recently acting up again like five months prior. He decided to quit working at my dad's business in December of 2016. He sometimes had these periods not breaks of not working. He had smoked Marijuana for several years.In early March, he was high on Marijuana and drove his car causing an accident with a parked car a block away. We have sent him on a mental institution for a week and being released. He was normal and tolerable. After five months, he was acting irregular, random, and plain crazy. Here is a list on what he did or does.

Say things out of the blue.
Write on books or random things. 
Throw things 
Never stayed at once place
Say things towards people
Almost used an axe on a neighbor's landscapers.  Walked barefoot in street towards the main Street. 
Slamming doors
Dropping weights on the floor.

I would like to know what is wrong with him.