Hi ,I am 36 years old,103 lb and I had a root canal done 3 weeks ago.The tooth was infected and I took amoxicillin and after that I also took another round of Z pack antibiotic.I still not feel well,I have a strong headache and a burning sensation in my eye and low fever.I don't feel pain around the tooth but I feel a pressure .The headache is concern me because is continuu .Could be still infected,after 2rounds of antibiotic? it is normal to feel like that after root canal?