Hang in there. I know what it's like to deal with the aftermath of a merger, having gone through three of them. You're thrust in, having minimal knowledge of the previous issues of the other company. You knew one way of doing things and the company you are now partner of had a completely different way. Of course, their way is "always right". You have to learn how their systems work and try to sort everything out before you can even start working on it.
Thank you for trying to sort these many issues out.