question: I am 29 years guy with 85 Kg weight & 180 cms height.  I had a sound health.  But since a month or so I am feel really drained out.  Feel very weak and sleepy after a few hours of work.  I am also suffering in sex life with very short erection periods & very difficult in ejaculation.  I really feel fatigued and stressed out.   I have a healthy life & healthy vegetarian diet.  Kindly suggest any medicine/tests.