The aspirin and plavix do not make you tired or weak. They are there to thin your blood and make sure your platletts do not stick together to form another clot. However are you on BP meds?. They typically give you high doses right after an MI and these can make you weak and tired since their effect is to slow down the heart as much as possible.
An individual should experience more energy and no chest pain after a stent(s) implant as the symptoms for vessel occlusions are chest pain and lack of energy . That was my experience, and I had had a silent heart attack (MI) causing congested heart failure (hospitalized for several days in ICU to stablize oxygen ratio, etc.).
You should have consult with a cariologist as there is a possiblity of restenosis caused by a clot at the site of the implant. The stent may have elastic "recoil".The main causes of small in-stent lumen after high-pressure dilatation are focal stent collapse, under-expansion due to lesion hardness or plaque prolapse through the stent mesh.