Sounds to me like you have bed bugs - who told you it was scabies? and who told you it was dust mites?
Dust mites tend to give allergic reactions - typically sneezing, but they do bite.
If you have bed bugs, you will certainly see bites but they can occur hoursdays after the initial bite
Scabies is easily treated just go to the pharmacist and show them your rash.
Furthermore most pharmacists will recognise your bites and rash and can give you a suitable treatment.
You might feel happier going to a Doc.
Bed bugs are more difficult as some species are resistant to insecticides - however they can be dealt with in most cases without great inconvenience.
Be aware that scabies is contagious and can be passed by skin to skin contact