What Causes Chills And Rise In Body Temperature After Taking Tamiflu For Bronchitis?

Hi, my husband had the flu from Dec 20-Dec 30, he was hospitalized for bronchitis from Dec 24-29. I started on tamilfu as protection on December 25 -- 1 pill a day for 5 days. Today (1/5) i have chills and aches and a temp 99.8 --- symptoms have come on within a few hours.If this gets worse I will go to urgent care, is there any Tamiflu protection still active? Is there any benefit to receive tamiflu again (Both my husband and I had flu shots)