I am sorry for your symptoms.
Your description suggests the diagnosis of scabies.
Following are the steps of the treatment for the resistant cases;
1) All household members and close personal contacts older than 2 months and not pregnant should be treated for scabies, even if they have no symptoms or signs of infestation.
2) Crusted scabies may require repeated applications of oral ivermectin and a local agent, permethrin.
3) Crusted scabies need removal of excess scale in order to allow penetration of the topical scabicidal agent and decrease the burden of infestation. This can be achieved with warm water soaks followed by the application of 5% salicylic acid in petrolatum or Lac-Hydrin cream.
4) Videodermatoscopy can be used to enhance the monitoring of clinical response to scabies treatment and allows for optimal timing of drug application.
5) Itching may persist for up to a month, even following successful treatment. Itching alleviated with an oral antihistamine, such as hydroxyzine hydrochloride, diphenhydramine hydrochloride, or cyproheptadine hydrochloride.
6) A scabicidal agent, such as permethrin, lindane, or ivermectin, is administered to destroy S scabiei mites.
You should seek a referral for a dermatologist.
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I wish your symptoms resolve soon.