Stent implants should have opened the heart's coronary vessels and the expectation subsequent to the stent implants would be more energy and no chest pains, etc. Ischemia means vessel blockage and reduction of blood flow to heart cells. Apparently, you have blockage (restenosis) with your stents, or there are new occlusions.
Additionally, heart muscle damage can reduce blood flow compounding the ischemic problem. You could get better if the site of blockage is identified and treated, and reduce the heart's workload with medication as well as heart healthy diet, exercise, etc.
So you probably have PAD (peripheral artery disease)? With ischemia your blood flow is limited and this is causing your pain. My husband goes thru the same thing, and can barely walk. He has had surgery to clean out his arteries to both legs, and Angioplasty with no relief. He is having another Angioplasty next week. He has 2 blockages higher up in his aorta, which are both very serious surgeries. He feels at 62 he doesn't want to go thru this serious surgery, and will accept the way he is. He continues to work which involves a lot of walking, he is in sales. He always has to "fake" phone calls to let his legs rest, so that he can walk a few more steps. He has had 2 stents put in. He also is more tired now.