First of all, I have to recommend the 5 minute rule to everyone I see. Really force yourself to work, do something - but only for 5 or 10 minutes. Usually after 5 minutes I get in the zone and automatically work longer until i finish whatever task i’m working on. Sometimes it doesn’t work and i only spend 5 minutes, but even then it’s usually because i’ve already worked a lot recently, and i feel better for trying.
But this does seem like more than just being unproductive. Do you feel like your work is pointless, is your sense of achievement gone? I find it really hard to do something if I can’t understand why even at a high level. You mention that only some days are off, if you’re working a lot the other days it could be mental exhaustion. Is your diet / sleep good and are you getting sufficient exercise? If your work allows, when you catch yourself staring at the screen take a walk or run.
But this does seem like more than just being unproductive. Do you feel like your work is pointless, is your sense of achievement gone? I find it really hard to do something if I can’t understand why even at a high level. You mention that only some days are off, if you’re working a lot the other days it could be mental exhaustion. Is your diet / sleep good and are you getting sufficient exercise? If your work allows, when you catch yourself staring at the screen take a walk or run.