I'm currently in a situation where our company (which is fairly small) went out and bought another struggling company. I am a software developer (the only one at my company after another was let go) and at the new company, there were 5. 3 were laid off, however, the 2 that were kept resigned. I'm now the only developer for both companies; and as a lot of issues have risen from the new company, I've had to go in and try to learn their infrastructure (usually up until past midnight combing through it).
I've requested help which they're looking into, but in all honesty, I'm just unhappy at this company now. The only issue is, as the only developer, it feels like they would be hurt significantly (maybe even irrecoverably) by my departure. There are people here that would suffer and I don't want to do that.
I'm just not sure what to do. I'm miserable here, but I can't bring myself to pull the trigger. I'm not sure a compensation bump alone would help, which I also hate bringing up ( I brought it up 4 months ago and I was told they'd "look into it" and it's only been brought up once again "we haven't forgotten").
I'm not sure what to do at this stage. We don't really have an HR department to speak with; all interaction would have to be with my manager.
Edit: Should I feel responsible for coworkers who would suffer as a result? Some I consider friends. Should I be looking for a new job?