I took six months off last year after spending six and a half years at a startup, from beginning through acquisition and eventual decline. I went from front-end developer to director of engineering, and completely burned out by the end.
I read "Ego is the Enemy", which helped me a lot in identifying why I stayed so long in a position that was bad for me (I was addicted to the title). When I quit, I established all these rules on how I was going to spend my day: out by 9am, back no earlier than 6pm, walk all day, take photos, become a better person.
Terrible idea.
I'd substituted one form of stress (imposter syndrome) for another (impossible goals). Pretty quickly I realized my mistake and accepted I actually had some baggage I needed to let go.
For the first month, I let myself do nothing. I could sleep late, watch movies, walk, or do anything else as long as I wasn't pressuring myself to succeed. In doing so, I was able to jettison my identity (I was a DIRECTOR after all..yeesh), and begin to identify what I actually wanted in life. It took me a full month until one morning I woke up without dread.
After that day I set a simple good: take one good photo a day. I eased back into a creative lifestyle, making sure I enjoyed the work every step of the way. My wife, through quitting coffee, inspired me to build an app that helped track my lesser addictions: coffee, chocolate, sugar, gaming. Now I was being creative and improving myself.
Through all this I learned what I really wanted, what was hurting me in and out of work, and with this knowledge I was able to rebuild my persona into someone who was happy and energized.
tl;dr Take it slow, don't pressure yourself.