For nearly a week now I've had really bad tinnitus and a headache. The only thing I can put it down to either catching a bug at a friend's gathering on Boxing Day with lots of kids ..... Or, I also upped from 2.5 to 3 grains of Thyroid S on Boxing Day. For two days I had really bad vertigo but did vertigo exercises and it is better. I haven't got a cold as such but have a slightly 'raw' throat and slightly sniffly. Ears feel really blocked tonight and neck slightly achy. Tinnitus is really loud right now and most early evenings. It's much better in the morning. I also noticed the top of my head and forehead is really warm. I'm tempted to go back to Levothyroxine 175mcg which was my previous dose for a few days. Has anyone else experienced this?