Accidental Aspirin Ingestion

[Jupster]

I am still breastfeeding my toddler (26 month old). Has been having nausea/indigestion, so someone gave me Alka Seltzer and i accidentally took it before realizing the massive amount of Aspirin in it. The package says 325mg/tab! And I took 2 doses of 2 tabs each (so 4 tabs total). I then fed my toddler. I am now so worried about Reye syndrome etc. How long do I need to watch him for this? And also, when can I feed him again? Feeling so sad and stupid for the slip-up . Please help! Thank you!!