According to the data you provided (being checked for physiological causes for erectile dysfunction, inability to completely solve erectile problems and turning back to the “start” of the problem), it seems that you are highly likely experiencing psychologically caused erectile dysfunction.
Erectile dysfunction is the inability to achieve or maintain an erection of the penis. The causes might be divided in two groups: physiological and psychological. The psychological causes include: stress, anxiety, sense of guilt, and low self-esteem. Erectile dysfunction in depression is also considered to be of psychological origin.
In the end, in older people the sex drive might be reduced and indifference might be causing erectile dysfunction.
You might want to consult with a psychologist to find out if there is any subconscious cause for your problem. He might be able to detect the presence of anxiety or depression and treat it in the first place. Visiting a sex therapist might also help you by discovering new ways of relaxation techniques and increasing the sex drive.
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