Idk if this is type dependent ...
Figure out what causes the extra stress/pressure, first. And then deal with that issue head-on, to decrease the pressure.
Do not stay up uncomfortably late just to get a start on stuff. This would be ok only as a one-off thing/temporary, and only if you wouldn't be able to finish on time otherwise - is not to be done as regular practice. Esp if you are already stressed, don't do it.
Just find some anchor(s) that you find usually gets you relaxed and structure your day right, i.e. decide consciously that you are done for the day at a specific time, you can stop everything non-urgent in the middle even, because it's time to go relax and rest. Generally keep your evenings free, the hours before you go to bed, just use these hours to wind down, relaxing or doing other fun activities that keep your mind free of stress. Alone or with others. It's ok if the relaxing is hard to get into right away. Just give yourself time to wind down is the idea. And you don't even have to focus on it too consciously.
Tbh I find anxiety about things that put you under pressure won't get resolved for long by trying to soothe your body. What works is dealing with the issue head-on. Maybe this is individual but this is how it is for me.
I'm thinking for me envisioning the future is what gets chaotic lately and needs restructuring all the time. It used to be fine but I made too many changes I think. It's ok I do the restructuring on my own in my head (no journals or notebooks), I just then get scattered again and have to get back to it again and so on.
What are you stressed out about with the schoolwork? The errands stuff sounds Se creative to me