Jazakallah Khayrun, guys.
Ill try to get a copy of 'The Prophet's Medicine.'
If you have any more suggestions, they will be very welcome.
For instance, related to exercising, diet.
In such circumstances, one should always seek advise from a doctor.
However, it may be that you feel the doctor's advice is not Islamic, so you start looking for cures/tips from the Noble Messenger of Allah (peace be upon him.)
Ragarding to this, it 'wll be very useful to find some info from the Noble Messenger (pbuh), relating to this particular issue, as well as maybe, any psychological treatments that the Propher (pbuh) may have suggested in order to improve ones dysfunction.
Wasalaam.