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.
Anxiety refers to feelings of worry, nervousness, or a sense of apprehension, typically about an upcoming event where the outcome is uncertain, or where the person feels he or she might not be up to the task. Anxiety is commonly experienced in high pressure situations, for example, prior to a making a speech or sitting an exam.