[MortenK]

You have a choice between re-organizing and leaving. If you decide to re-organize, icambron's advice on this thread is really good.

But if you are beyond that point, and it sounds like you are, just get out. Take your co-founders out for a beer and give them straight and honest talk. Some might get disappointed, but more likely they will be sympathetic. Even if they are not, it's their problem. While I understand the pressure, you mustn't sacrifice your health for other peoples opinions.

You emphasize freedom a lot. As you know, this can't be found in an agency setting, as ultimately you are at your clients' beck and call.

If freedom is your top goal, you should aim for independent, freelancing / consultancy or potentially becoming a micro ISV.

A possible solution could be to withdraw from day-to-day management, and act as a part-time, possibly remote freelancer for your own company. Doing what it is you like to do for perhaps 10-20 hrs pr. week.

Your co-founders may or may not accept that, but it's an out that could work decently for both parties.