Opportunistic infections (OIs) are infections that occur more frequently and are more severe in individuals with weakened immune systems, including people with HIV.
Being nostalgic means to miss the past time. It seems that a real life was in the past because now in the present is different, probably things changed and we know that never is going to be the same. It leads to a nostalgic feeling.
This feeling is often described as: 1  Feeling afraid all the time. 2  Feeling that you are in a constant state of fear. 3  Feeling that everything scares you.  Feeling like you are always afraid and react to everything with 1  fear. Feeling like a constant state of gloom, doom, and foreboding follows you everywhere.