It sounds like when I get hayfever (and also if I have been wearing my contact lenses for too long without removing them). Little particals of dust get under the lids and irritate and scratch your eyes, the itching for me is caused by the allergy side of hayfever. The best relief i have found for this is to flush your eyes with saline solution, and then lay down with a cool damp cloth over your eyes - and at all costs try to resist the urge to rub them; it will only make them worse.