You're doing a lot of stressful things right now. Dealing with the fallout from a DUI, getting sober, looking into a new career, all your self-improvement tasks. No wonder your body might occasionally feel the need to shut down.
As you say, you're still early days in your sobriety and there's no shame in taking some time off now and then from making plans for the future, in order to get the rest, mental and physical, that you need. Staying sober is the biggest change you're making for a better future, so make sure you don't push yourself too hard and put that at risk. It's all about finding the right balance.