I've been keeping a journal for awhile now. I think writing down particularly strong emotions helps me move through them a little easier, because I've noticed that once they're in the notebook, they don't last as long or control my actions.
Excellent! When you write, you are also working through the issues causing the strong emotions. You loosen the hold they have on you. I have yet to go back and reread anything I've written, but I think that's okay.
That is more than okay. The notebook will keep them safe. You don't need to revisit unless you want to look for patterns and break the patterns. Look for instigating events and move through those events differently next time.
I do drawings, too! None of them are particularly good, but sometimes the words are just too much to assemble. I've tried keeping journals in the past, but got too caught up in how I 'should' be doing things instead of just doing them. I don't write in it every day, just when I think it will help.