Greetings. Welcome to HCM and thank you for your question. I read your query. 
Well, yes, of course, you can go to another hospital or doctor for review and control. I am glad that you have followed doctor's advice with a great discipline. The procedure of percutaneous transluminal coronary 
angioplasty (PTCA) with 
stent placement requires a good discipline by the patient and careful controls, at least for the first 6-12 months, period during which, the probability for within stent narrowing is the highest. In our clinic's experience, we recommend to post-PTCA and stent patients that 
clopidogrel 75 mg should be taken once daily for at least 6 months (in cases of bare metal stents) and 12 months (in cases of drug-eluting stents); to discontinue 
smoking, if they are smokers; and periodical controls with a cardiac 
stress test after 1, 3 and 6 months from the procedure. Also, if the stent was placed in a terrain of 
acute myocardial infarction, an 
echocardiogram is required three to six months from the procedure, to evaluate if there is any gain in left ventricle function after the urgent procedure. 
Wish you all the best. I hope I was helpful with my answer. 
My regards, 
Dr. Meriton