My doctor prescribed (2) 500mg keflex twice a day, can i safely take it 3 times instead because I m not feeling better since I started taking it 6 days ago. I feel worse. Now my ears, nose, throat, face, and eyes are feeling swollen and rather than sore, are actually hurting. Not to mention the cough, sweats and light-headed feeling. BTW it comes and goes unbearably at night. 54 y/o female, 5 3, 217 lbs.