Tools and best practices for organization and productivity

At my current job i am responsible for A LOT. I handle all of the systems, network, desktop support, call center, i write software (WMS, CMS, B2B Website), among another 50 different software development projects.

As a director i am also involved in business planning, process development/review/implementation, and i tend to be the go to person by the rest of the Director team for anything large scale they are trying to manage.

I am paid very well and i love the job but i am just having a hard time getting my arms around all of the different requirements.

I am looking for the tool(s) that the community uses to manage everything. I understand GTD i am using todoist and evernote and things are "ok".

The work i do is so diverse that i don't think any one or two tools are going to cut it but i need a way to keep track of commitments, priorities, tasks, planning (short and long term), documentation, ... you get the idea.

Tool/app suggestions are welcome but i am more interested in how you pull all of your tools together and use them as a cohesive unit. I am having a hard time defining what i "want" because i want a way to manage EVERYTHING.

Thanks!