There is the depression where you feel truly horrible. That is one form. There is also the situation where you are dissatisfied and you don’t have any interest, and perhaps you think negatively often. I think depression seems to go along with schizophrenia. It did for me. A doctor can see the depression and may try adding an anti-depressant drug. Some doctors fear doing this because they worry about triggering the mind into another psychosis.
Anyway, in response to your question, having depression is a possibility. The anti-depressant drugs help some, over a period of time. I did not see immediate effects.
I had severe depression and antidepressants helped me. The antidepressants worked for depression, but not for the negative symptoms. So, I had no more suicidal thoughts, but still had lack of motivation (avolition). I remember it was like bearing a bag full of rocks on the back.
I remember my doctor tried to increase the dosis of fluoxetine in order to improve my avolition, but we had no results.
I’m not sure if memantine helps with avolition because, when I started to take it for negative symptoms, I had already minimal avolition. However, memantine helped me a lot with social withdrawal and the more I interacted with people the more I would be engaged with different activities like hanging out with friends (bars and clubs), taking languages classes, going to college, playing indoor football, training Kung Fu, etc.
Maybe a medicine can help you but I would make some effort to feel things again because neuroplasticity and neurogenesis will just happen if you take action.
Some traditional wisdom make sense when you want to make neuroplasticity and neurogenesis happen:
Healthy diet (omega 3 fatty acids seems to help);
Healthy social life;
Learning new things (languages, instruments, etc);
I didn’t think that antidepressants might only take away some of the symptoms. I thought I could just take them and everything would be fine.
I see you think exercise would do me some good. I stopped exercising during the winter because it was too cold for me outside. I’ve been waiting for it to get warmer so I can walk outside with a T-shirt, it’s not long now.
But I really need to get rid of the lack of motivation so I can work a little bit.