I have had to learn the hard way that looking after yourself is not selfish. It is the complete opposite. Looking after yourself, be it, small forms of self care, making sure you read a book at the end of the day or taking the time to have lunch, enables you to be the best version of yourself you can possibly be. It makes you more pleasant to be around, allows you to focus and be there for those around you, yet looking after yourself is the first we neglect. We are conditioned to do so.
The hardest thing I had to learn is admitting that sometimes I do need to take a step back to relax and recharge. When my anxiety levels rise, I know the best thing for me to do is to take a step back, rather than carrying on with tasks when my head is not in the game.