i know that overload feeling too. journalling is a great way for me to process and move forward in my therapy... i was going full steam ahead, and i ran right into an internal wall.
made me pull back a lot in therapy and took me over 2 months to get back to where I was. as a resutl, i don't journal as much and i kinda miss it... and for a while, i felt like i wasn't really doing the work if i didn't work so hard at processing. now i'm discovering, the work still gets done and i don't have to try so hard.
it's good to slow down ... and it's ok.