Hello,
Loss of interest in others, An unusual drop in functioning, Problems with concentration, memory or logical thought and speech that are hard to explain.
 Loss of initiative or desire to participate in any activity etc are symptoms that can happen with 
depression or stress disorder or even OCD.
 Exaggerated beliefs about personal powers to influence events; illogical or “magical” thinking symptoms comes under OCD as well as 
schizophrenia or 
personality disorder spheres. 
Rapid or dramatic shifts in feelings from happy to sad and vice versa are mood swings and comes under anxiety and depression. 
In view of the above assessment, it has to be anxiety and 
stress-related disorder and maybe some depression. I suggest you to 
consult a psychologist for therapy. As these symptoms are not much severe, you may not need medicines. 
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr K. V. Anand, Psychologist