The day i masturbate 2-3 times, next day i feel really depressed,lethargic.happens consistently, not psychological. what's the cause?is that normal?

The obvious question: is how long is each "session?" Maybe you're just tired. Aside from that, why do you masturbate that much. I'd see a psychologist and ask questions about sex addiction, history of exposure to sex-related materials, and do a general mental health screening. You might be self-medicating for depression or anxiety-reduction. You may be too socially isolated, and masturbating reminds you...

Depression: Thank you for informing about Fatigue, Patanase and Breathing difficulty. It seems that stress is causing depression with lethargy and it is increased due to guilt after masturbation. Patanase may cause depression, or worsen depression. Have Heart to Heart Talk with your partner to improve Emotional, Physical and Sexual Intimacy. See Psychiatrist for Diagnosis, Therapy and Medication