I have had a headache for the past three days on the left side of my head, i don't usually get headaches, very light pain though, I also have a tooth that needs a root canal, but am in absolutely no pain from it, and there is no symptom of an abscess. Is there a possibility it could be toxins from my tooth causing me to have this headache, or that i may be having an aneurysm as a side effect?. I have been taking amoxicilin, bactrim, and levaquin just in case of bacterial infection.