Hello, I am Rafael. Thanks for asking your question - I'm here to support you.
It could be that sadness, further stress and their somatic expressions appear whenever you feel pushed by challenges or problems every relationship brings. People develop defenses to try to cope with further painful experiences and depression as well as migraines or any other somatic symptom could be used as a way to cope, unhealthy ones for sure but at least something to avoid further exposure.
These symptoms-mechanisms are fueled by feelings you have been holding in from previous experiences, thus the only way to break this circle is to work on such past issues-feelings, process the experiences, learning from them and allowing yourself to gradually develop refreshed trust and intimacy in present relationships.
No doubt psychotherapy is ideal tool for you to work on these areas. I recommend you to seriously consider professional support to take care of feelings from past and present challenges connected to them.
Thank you. I will contact a mental health specialist first thing tomorrow morning to begin work of past issues affecting future relationships. Mistrust is definitely a biggie for me.