How do I deal with stressed out people at work?

I recently joined a small company, we were very excited in getting it to work. I brought in a huge corporation which was great, my boss. because of this was given another small company to run.

I have two issues, since the merger my boss has become very distant, thin and never at work. Which is causing stress amongst the ranks. I got angry yesterday and left. My questions are two fold, I can work from home and avoid this stress, which may be a good idea as why put oneself through this?And two, in the past and now managers ride on me bringing in clients and good ideas and I am never promoted. I would love some feedback. Also leaving in a huff yesterday looked unprofessional but I was trying to get business through and the whole office was just joking around and couldn’t be bothered. Including my boss. So how do Iclaim back my professionalism without brown nosing.