You are a PA working in the ED. A 74-year-old R handed male is BIBA following a collapse at home. He can follow one-step commands but appears frustrated upon further questioning. He has a right-sided weakness with a power of 2/5 in the right arm and leg. His right eye is reacting to light and moving slightly slower compared to his left. His pulse is irregularly irregular and his BP is 150/90. He is on aspirin and furosemide. What is the most likely diagnosis?