"At least", my butt. You just did your first marathon with a new cold!! Most of us would be whining around the house clutching our kleenex and cup of tea. YOU ran your first marathon! And you finished it. That is amazing in my book. Yeah, Teigyr! Nothing like good, steady, serious, quiet training to stand you in good stead. 
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks