My 3 year old dog wont stop itching her head, ears and eyes, been 2 weeks now, helpp?!?

I have a 3 year old labrador, she has started itching her ears first, shaking her head fastly, so i applied flee powder, then she started itching her eyes, hair has come off around her eyes and they are red and swolen, she keeps scratching her neck and rubbing her head on the carpet, we have found a tiny bump on her neck that looks grey/black but cant tell if its on her skin or attatched to her hair. We have tried ear drops, one big dose of flee spot on, gave her a bath,hayfever tablets anybody know what it may be? please help!! x