having a hard time relaxing

I don't know if anyone else here is struggling with taking it easy and relaxing, I know so sure am! I could use some advice. I am a perfectionist and am typically very hard on myself, especially with my work performance. before the new year I got a promotion at my dream job and have been working hard since I don't want to let anyone down. It's been very busy and now I think I'm getting sick but when I get home I can't seem to let myself relax and take it easy. I'm pretty sure I'm getting burnt out but it's so difficult to let myself take a sick day or a day for myself! How do you let yourself relax?