Physical stamina symptoms and conditions

I am 55 yr old male with high BP, Some joint degeneration, high cholesterol. I have been on Zocor for 40 plus days. When I first started taking it, within hours of dosage I had mild headache, sinus stuffiness. Within days I had higher energy levels, less joint pain, and sleep better. My physical stamina has increased and I am able to be much more active with less physical stress and faster subsequent recovery. Follow up tests show my cholesterol dropped from 230 to 160. Continuing adverse side effects are mild burning sensation in back of throat about 1 hour after dosage and lasting about an hour. Change in taste. Both of these I can live with given the positive side effects and intended effect. Follow up tests have so far shown no impariment in liver function.