Whether it is social phobia, specific phobia, post traumatic stress disorder, general anxiety disorder, obsessive compulsive disorder, or similar, it falls under the category of anxiety disorder, and calls for clinical evaluation and possible treatment.
Individual treatment is often termed as psychotherapy, and is meant to help people with their emotional issues, which can range in order of their severity or intensity. The main aim of this form of therapy is to change behaviors by finding their true root cause and helping one learn to cope, avoid, and eliminate these stressors wherever possible.
Depression is a mental illness, which one should not confuse with the short-term emotional distress, anxiety attacks or feeling low, which also are constituents of depression. Anyone can feel low for a brief period of time.
A relationship goes through numerous phases during its life cycle, and it is obvious for it to have a few rough patches. However, the strength of a relationship is reflected in how the couples deal with those rough patches and how they cope with stress, both as a couple and individually.