What are some tips for working long hours 5 days a week?

I went from having a part-time job for many years to having no job, thanks to covid, to now thankfully having a full time job. They have me working 5 days a week. Going from barely working to suddenly working (and being in the same room all day) 5 day’s a week is quite an adjustment for me. I don’t want to seem weak, And I really do need the money—BUT I’m having moments of Panic about it! Any tips would be appreciated <3