Hi Mam
Thanks for seeking help here.
Personality shift ..... perhaps you mean to say significant changes in the Behavioral and attitude from your past behaviour. Depression is very common illness with symptoms of low mood , anhedonia, decreased energy level, poor concentration, attention with occasional feeling of hopeless, helpless & worthless. If you have any such symptoms let's have discussion for better results.
Next Steps
Start Yoga and exercise for all these symotoms.