Same happened to me, thought I was getting over it then came back to kick me in the bollocks!
A couple that were 3 days ahead of me in symptoms, on day 7 she got better, he got worse. Doctor was round with antibiotics.
He's on day 12 & started feeling better, even getting up & about, 6 hours later his wife reported he was collected by an ambulance!
Carry on taking it easy, it's like it comes in waves. My temperatures stopped on day 5, then woke me up at 4am on day 6. Fine again later that day.
All the best, but make the call if you need too