Had some symtoms of sepsis, 3 weeks ago blood test normal,have been fine since that one day was it something else,symtoms was heart rate, chills, head?

Interesting question: Many of the viral illnesses will have a viremic phase that will mimic the bacteremia of sepsis. Allergic reactions to a food or insect bite may also have some overlapping symptoms that make the origin difficult to pin down. Be aware of your exposures and vigilant about recording these findings.You may be able to identify the cause by history alone.

Not sepsis: It was probably a viral infection that your body was able to fend off pretty easily. Sepsis is a severe illness and results in hospitalization. Since you are fine now I do not think you had it.