Hi... Before answering to your queries, let me provide you with few facts that are needed to be understood.. The facts are that following an injury to the head, it is rare that an physical injury on its own to be the cause for the sexual dysfunctions to be the cause.. Research has showed that most often it is the psychologenic causes that is responsible for both erection dysfunction and the premature ejaculation following an injury.. The only exception is when there are serious brain injuries or when there is a disturbance to the hypthalamic pituitary dysfunction which is a rare episode.. Hence it is the psychogenic causes that is probably the cause for these disturbances and not really the injury itself..
It would take a few month probably 5 to 6 months for symptoms to improve and improvement depends on individuals. Lack of sleep and the stress can also add up to the situation..
Now to your queries, to help in faster recovery, these tips are adviced. Practise Keegel's exercises, Master,s and Johnson's exercises, multivitamin pills, protein supplements, acupuncture techniques, good and regular sleep, physical exercises, yoga and meditations. He can consult a sexologist and a face to face doctors from the experts should make him feel better, else he can talk to chat with a doctor on this website or take an opinion from the experts through mail or phone.. Wishing him all the best and hoping for a faster recovery...