As per my understanding, the patient seems to have triple vessel disease and the doctor has put one stent, but two other arteries having 100% blockage are left untreated. The ideal treatment for triple vessel disease is CABG, but there may be some more underlying factors due to which the cardiologist may have advise against CABG. You can always take a second opinion from other cardiologists, who on evaluating the patient and the reports will guide and clear all your doubts. Consult some of the Best Cardiologists in Mumbai, or any other city. Hope our answer helps you.
As per my understanding you are a 30 years old male with high cholesterol levels, for which you have started the treatment, you want to know for how long you will have to take the medicine for same, and possible side effects of same. For this, you should consult a cardiologist and you can discuss in detail about the medications and also have a clear idea about various options and available medicines that best suits you. In general these medications are taken for quite some time and do not have much of side effects. But of course if you do have some discomfort then you can consult a cardiologist, and get an appropriate medication for the same. For cardiologists you can refer this page - 10 Best Cardiologist in India.