Tingling lower calves both? septicemia? brain?

Observe that symptom, see your doctor if symptom persists for more than 24 hours and/or more symptoms occurred. At times, our body has symptom without a definite etiology but it's short-lived. Do not think of the worse scenario such as septicemia or neurological disease.

Tingling in the lower extremities can be due to peripheral nerve or blood vessel issues, but may be transient and rather inconsequential. Unclear why you have concerns regarding septicemia or brain disease. Discuss your fears with your doctor and pursue persistent symptoms.