As if it's not bad enough to have worms crawling on and thru my privates, I had an awful allergic reaction and had what I call INSANE itching. My poor butt was oozing lymph and the whole area was covered in 'bites' that looked like a mosquito bite. Anti-itch cream was the only topical cream that gave me some relief and I had to take tons of anti-histamines. At one point I was taking 2 Reactine and 5 or 6 Benadryl a day to cut the allergic reaction.
What also helped a great deal was to stop using toilet paper. I think wiping just spreads the eggs and their glue (for adhering the eggs to the skin). I use a hand held shower head to wash with. If the hose isn't long enough, squat over the bath tub. Either that or take a jug of warm water to wash with. I wash 3 or 4 times a day depending on the activity and my allergic reaction. For me keeping the allergic reaction is key to at least getting some sleep.
A couple of months ago I took Vermox twice a day for 12 days, then off for a week or 2 (I forget now) then on for another week. Unfortunately there was no change what so ever. I certainly hope that you have better luck!