How to get rid of scabies?

I understand and sympathise we you... I have seen 3 NHS dermatologist and 1 private over the past 10 years! I have seen a doctor for my mental health because being told its in my head. I know absolutely the signs track marks scratch marks rash on breasts/ buttocks/ back of knees/elbows/ feet and even getting on my neck face and scalp now! I use permethrin practicaly every other day which I have to buy on line and I've bought ivermectin tabs on line but to no avail... it keeps under control but does not get rid I feel some time at my lowest point to just call it a day as it has ruined my life and no one will help me. I am running out of money as the price of permethrin cream as gone up so much and if I can't get it anymore my life will be surely over! It started at 56 years old I am now 66 years and live alone I have had no partner at all.

I used ivermectin 48 mg 3 days a week then 36 mg the second week on the third week I used 24 mg. All 3 days apart. It is by weight and I was 135 lbs. I used the cream once a week.