@toni A bit of unsolicited advice, in the hope that it helps: on the face of it that sounds like burnout, and for me the most effect way to deal with that has been to just immediately declare the day "over, impossible to salvage", and go do whatever else I feel like doing for the rest of the day.

Sometimes I'll magically become inspired again later in the day, due to the weight of "performance stress" having been dropped from my shoulders (now it's just something I *can* do, not something I *have* to do!), sometimes I won't. But either way it helps a lot for me to recover :)

Trying to 'push myself past it' only worked for a while, and eventually started becoming counterproductive... of course this may work totally differently for you! But it took me a long time personally to figure out the "declare the day over" approach, so hopefully I can help to save others from that delay :p