I cannot transition between tasks

By far the biggest issue that my ADHD causes day to day is not actually paying attention, it's being absolutely incapable of task switching or transitioning. Any activity that involves some transition from one state to another can be incredibly difficult for me.

For example. I work mostly from home since the pandemic started (I'm lucky to have a job that has continued to allow us to do this). Today I sat down at my desk about midday to work and turned on my laptop. It is now quarter past 5 and I haven't touched my work laptop because I cannot get off my personal laptop. I literally cannot take the step of drawing my attention away from the personal laptop and re-directing it to the work laptop. I cannot transition my brain out of 'not working' mode to 'working' mode. I didn't have any work that urgently had to be done today so it's not a problem from that point of view but it's so frustrating. I actively wanted to get work done today but I couldn't because I couldn't make the switch to start.

This problem means that often I wake up and then lie in bed for well over an hour because I cannot transition from 'in bed' to 'out of bed.' My brain can't take the step of moving me from one state to another. On days I don't have to do anything I can do this for 3-4 hours. I am late to things frequently because I can't start the mental process of getting up and leaving the house. I sometimes don't eat because I can't stop what I'm doing and go and get food.

I want to be clear that when I say I can't do these things, it's not that I forget to do them because my attention is absorbed by something else. I am very aware that I need to do them. It feels as though there is a switch in my brain that needs to be pushed down to enable me to move from one thing to something else but I can't push it.

I have tried setting alarms but I just snooze or turn them off. They don't prompt me to do anything.

Has anyone else dealt with this? It's having a significant impact on my life.