Hello, I ve had a Sinus infection for some time now with quite severe symptoms including complete loss of balance, deafness, seeing flashing lights at night/when eyes are closed, very light brown stool (almost golden), complete congestion, intense headaches, nausea, dizziness, constant tinnitus, jet black circles under both eyes, nose bleeds in my sleep and several more. I ve recently been treated with 500mg of amoxicillin 3 times a day I took my last tablet last night however, my Sinus is still congested, (I ve just done another bout of steam inhalation in an attempt to rid my Sinus of excess mucus) I m experiencing slight abdominal pain and there is now a small amount of blood in my stool.