The 'flu' is quite a general term you're using to describe a number of symptoms.
What kind of symptoms do you have? A cough, cold, runny nose, fever etc.?
Different symptoms require a different treatment approach.
If you really don't want to go to your doctor, go to a Pharmacy before work or during your lunch break or whatever.
With fevers, I usually give customers just your every day Panadol or Nurofen for the headaches, coughs can be treated with varying OTC medications which depends really on your specific symptoms (dry cough or expectorant etc.)
For now while you're at home, drink lots of water, maybe take some vitamin C or orange juice if you have any, and rest, simple as that.
Of course, if you're still not feeling well after visiting a Pharmacy, definitely go to the Doctor.