Returning to work after bereavement leave

My dad died about 2 weeks ago and Monday my bereavement is up and I return to work (don't have the financial ability to take any unpaid leave). My clients all have intense trauma they are navigating. I don't know how I'm going to be able to help them l navigate and heal with their pain while I feel like I'm still drowning and suffocating under mine.

Yes, I have a therapist. Yes, I have someone I can use for supervision. Yes, I have a good support network. But I don't know where to start with compartmentalizing when I'm going to be back at work. And then there's the brain fog and time loss of simple things taking forever to do and thinking I just blinked it looked away for a couple of seconds and 30 minutes have gone by.

I'm asking if any therapist here who has gone through grief similar to this can share what helped them during those early times back at work. I know everyone is different and what worked for one person might not be for me, but like I said, right now I don't even know where to start to try and do this.