Everyday life can lead to stress which is a part of life. While stress to a limit is okay but it shouldn't affect your sex life. Going through too much stress can impact your life in different ways, such as having low libido, leading to not being able to have sex. It's best to talk to your partner about this issue so they know before trying to get intimate with you. You might need to opt for some physical activities which can help you relieve your stress, such as cycling or running. Activities such as yoga and meditation can help too.