Relaxing methods?

How do you girls help to relax? I have been so stressed out with my job and dealing with my infertility.. that I literally feel as if I can go on a freak out trip and any moment I don't want to explode at work and I don't want to freak out on my husband. But, I literally don't know how much more I can take. Please help me!!

Work back story: My coworker is on maturity leave. I've been filling in and doing her job. I have learnt so many new tasks and they keep adding more while still doing my regular job. So, her position that I am doing. I have convinced myself that I don't like doing the work so when I get demoted back to my regular position, I won't feel disappointed. But, it's coming off to my manager that I am miserable in my work environment. I don't want him to think I hate the work. I'm just trying to make it easier to cope when I switch positions again.

Infertility: We've been ttc for 6 years with no success. I can't tell you what's causing the problems bc my dh refuses to get the sperm analysis done. So no further testing will be done until he does the SA.

Everything is so frustrating right now bc I feel like no one understands my point of view. I need to learn how to relax. So I don't lose my job and I don't flip out on my dh. I'm 100% to my breaking point!!