I feel for you! Ivermectin may not help, I tried it twice with very little results for this. I used it previously for a skin parasite issue I had about 4yrs ago, and it worked for me with that after the 3rd. dose.

Anyway, you can get this cheap in a Farm supply store like Tractor Supply as "Horse De-Wormer" gel. The tube has increments on it for different weight horses, starting at 250lbs. Just judge how much gel you need by weight, and take it. It doesn't taste bad for a medicine, it has an apple flavoring. Horses usually think they're getting a treat with it,,,lol.

There are also many different common meds like Fenbendozle there as well. I had some success with Pyrantel Poamate liquid from Amazon, or E-bay. It knocked a few worms down, but not all. I read that it killed them, but it didn't, it just paralizes them, then you need to take a laxative with it to flush them out. The Dr. gave me 2 Albenza pills twice, and it didn't seem to help, then he refused to give me more. :(

Hulda Clark's remedy for Roundworms, & Tapeworms, is 3000-4000mgs of CQ-10, plus L-Cysteine 1000mgs. I haven't tried that yet. The problem is getting CQ-10 in raw powder, or liquid form, rather then taking 40- 100mg gel caps. I itend to try it because each time I take 2- 200mg gel caps. I can feel a tapeworm, & other parasites squirming in pain.

At this time I'm taking Apple Cider Vinegar pills, 3 times a day. It seems to affect them, but no total success yet.

I dread taking any more meds, because I have liver issues!
Try what I said,
Wishing You, & your family Good Luck, & God Bless1