Hello dear Understand your concern I think you have fatigue and anxiety that cause erectile dysfunction. Following are the other cause of your problem: obesity, smoking, alcohol, psycho social stress, hypertension, diabetes, prostate pathology.You have to consult the urologist for exact diagnosis after following investigation: blood sugar, health check up, Hb, CBC, PSA color doppler USG. Meanwhile take following advice: start exercise that increase your stamina, take healthy diet and fruits, anti oxidant like vitamin A, C, E and co Q, talk about your problem to your partner and get relax, engage more in foreplay before intercourse, kegel s exercise, hold urine for sometime before urination, try comfortable position for sex like partner on top, you can also take sildenafil plus paroxentine 30 minute before sex after evaluation, use double condom. Hope this may help you Best regards Dr. Sagar