Suggest Treatment For Episodes Of Black-outs After Having Cardiac Stent Placements

Hi, I have been getting strange symptoms. I had cardiac stent done in March. Previously at long intervals, Have had odd episodes of almost blackouts out of no where, while walking or sitting but disappear within 1-2 seconds. Only once had one 3 years ago, and my left foot felt abnormal after like i had lost control of it. Had two of these episodes in last two weeks without delayed effects. Last week had holder monitor. Did not show much, but occasional SVE. My dr not convinced cause. We are taking grand daughter to state in 5 days for international chromosome 18 conference so I can t see neurologist till I get back! However I notice after work day, I get really tired, and last night while walking around after work my left foot again started getting strange like it was not mine. I have had this before without the blackout. This seems to me like a brain thing. .?? What do you think.