If you feel like hospital is the best place to manage how you're feeling, sounds like the way to go. If you find it to be a constructive resource, use that resource.
Emotion is definitely an interesting topic. When I came across a definition of 'emotion' as being 'energy in motion' (e-motion), I can recall thinking 'That makes so much sense'. Can definitely feel a stack of emotion/e-motion when it hits. Can be breathtaking and not always in a good way. The ability to feel our thoughts and internal dialogues and the hell they put our body through can be challenging, to say the least. Weird to think our thoughts and internal dialogues can hold a massive amount of energy, depending on what they are or sound like. Imagination's the same. What we see in our mind can 'charge us up' in either good ways or not so good ways.
They say each memory holds a very specific kind of energy. This is one of the reasons why mental health professionals try to help a client change their perception. For example, while there is an incredibly challenging kind of energy attached to feeling from the perspective of a victim, the energy experienced through the perspective of a survivor has a different feel to it. This explains why survivors are committed to helping other survivors find their power. They've experienced the different feelings for themself.
While I'm happily a woo woo gal, into the spiritual perspective of energy, I also love how quantum physics explains things. Every cell in our body vibrates with energy, which keeps us alive. Frequency and volume have a dial. Ramp up the frequency (the speed) and volume (how much) and we'll begin visually shaking with every cell in our body in a state of hyperactivity. If it all becomes too much, our body will simply pass out. Kind of like 'factory reset' mode. The human body is incredibly intelligent.
Managing what our mind does to our body and what our body does to our mind can be one heck of a challenge at times. Managing the state other people can put us in can be just as challenging. Another benefit to the hospital stay could involve getting away from your room mate for a while. Sounds like he's not good for your mind and your body. Managing to calm things down is the #1 goal.
Sounds like you're in an extreme state of hyperactivity. People simply saying 'Calm down' can be a trigger, to frustration and fury. Accessing resources with which to calm down is a help, while reflecting your ability to manage.