Track your stressors. Keep a log or journal of situations that cause you the most stress during the day, for a couple of weeks. Note your mood, reactions, and activity when you go home. Assess whether or not these situations are negatively affecting your home-life or health.
Start enforcing healthy boundaries such as creating time slots of unavailability for self-care in your calendar and making sure people in your life including your co-workers know about it well in advance, so they have time to plan around it.
Keep in Mind:
If you feel like you don't have control over these situations, seek support. You may need to have a discussion with your supervisor, also find out if your employer offers stress-management support.