What Causes Fatigue And Sharp Pain In Head Along With Ringing In Ears?

For several weeks, I have had dull headaches. This is very new for me, bc I rarely ever have headaches. About a month ago, I suddenly had a pain in my head and had to immediately sit down. It lasted for half an hour, or so. I went to the doctor and had an MRI. It showed some fluid in the sinus cavity and I was given an antibiotic to take for two weeks. During this time, I ve developed new symptoms. I have pressure in my head, I m very light headed, very fatigued, have occasional sharp pains in different areas of my head, and have ringing in my ears. This morning, I felt like I was going to faint and the room began to spin. Could this all be related to the possible sinus infection? Thank you for your time, Suzy Bell