18 years old. Used to get erections VERY easily(but used to leave it be and only sometimes masturbate to relieve myself) but suddenly recently its becoming difficult. Took a blood test little while ago and it showed high liver function(like 10%over normal) otherwise blood sugar,cholesterol and thyroid levels were ok. What i've done a little different is i've taken Cyclimycin alternating between once and twice a day for a continuos period of like two weeks i think,i've taken it before but not as ritually. I am willing to go see a doctor but before i go i'd like to know what must i ask to be tested in my blood test ofcourse other than free testesterone and i'd also appreciate some answers if anyone has to the above situation.