I have had a Flu / cold with severe sinus headaches for 3 weeks now. I have been self medicating with Nurofen Cold & Flu, Beechams Flu, Sudofed Sinus and pain killers. Nothing seems to have helped. Today I became very dizzy, felt I may be sick, fatigue, I did think I was going to faint and had to rest. The feeling after 4/5 hours has not went away.