Henry,
I'm glad you had your heart attack when someone was around. You could've been off on a lone wolf trek and been in real trouble.

Yes, aspirin is a good blood thinner and also brings down blood sugar levels. Enteric coated baby aspirin is best. The blood thinning property can last up to a week. When you go to surgery, docs usually pull people off the aspirin 1-2 weeks in advance to avoid bleeding complications during surgery.