I have had it milder before, maybe 2 or 3 years ago but for the last week or so it's been on fire! No amount of itching will relieve it, just washed with T-gel and it's flared up again. Last time I had it it was after using Herbal Essences shampoo, and I used it again at my mums and this happened, but it's been a week or so now! What will make it go away?