Dust mite allergies ? are the aymptoms I have rare or severe?

I have had a itching problem for ever it seems but worse within last year. I finally did some research and came to the conclusion it is that I am allergic to dust mite allergin. but I itch severly and have visible bumps similar to a miniature mosquito bite. aso it happens more in bed. I v vaccuumed my futon mattress and changed my sheets repeatedly.