It sounds as if your GP is happy this is benign enlargement. These drugs are well tolerated but if you do feel faint on getting up you simply stop.
If your GP wants a second opinion, go with it but the treatment is either these drugs or surgical prostatectomy. Nowadays urologists don't go mad with surgery but core out the middle, so younger patients will expect to come back in years to come for a re do. All surgery has a risk but it is low. retrograde ejaculation is relatively common.
At the end of the day any treatment is for the symptoms. If you do nothing you come to no harm - the prostate slowly enlarges regardless - so you must decide how much the problem effects your life.
Please don't listen to comments about cancer as pushing doctors to rule it out is far more risky.