I doubt that you can feel worms crawling though the intestine, but I know from my experience with pinworms as a child , you can feel them crawling in your rectum. I also believe that I have seen whipworms in my stool, but from what I here whipworms are harmless.
I had a lot of pain in my gut when I was ill a few years ago, I think it was candida, I tried to eat raw cloves of garlic and other such suggested cleansing diets and I think it made it worse. I don't recommend Trying to flush worms out with garlic, the amount needed to effectively expell worms may actually aggravate whatever is really causing those odd sensations.