I suggest you have a surgery asap.You should seek emergency care immediately if you experience sudden numbness to one side of your face, arm or leg. You may also have difficulty speaking and slur your words. If you lose sight in one eye, cannot stand up straight or keep your balance, seek help immediately. Even though it might go away within an hour, you have no way of knowing when you might have a full-blown stroke.
I cannot answer this question as stated, other than to say it depends on a lot of things. If you are concerned about the risks of surgery you could have a consultation with a cardiovascular surgeon. I assume you had an angiography and that is how you know about your blockage. No sense waiting for an ischemic event or anything. Consult the specialist.