SOS Cat with roundworms!

I got my cat when he was a kitten from a shelter. His paper work said he had dewormer twice before I got him. I got him in July and he's an indoor cat. In September he puked up from roundworms, went to petco, got some medicine and he seemed to be okay. About a month later, puked up some more, this time there was blood in it. I took him to the vet, he got some more medicine and he again seemed to be doing fine. As a side note, he had no symptoms of having worms like everything online says. He's an energetic, crazy cat, eats normally. On 11/27/15, I left him for the night with my dad. He called me saying he saw my cat playing with a cricket, he didn't pay attention to it, a minute later he came back and this worm was next to it. He actually said the worm was attached to the cricket. So, I have no idea whether this worm came from my cat or the bug.. Anyone have any ideas.? I'm assuming if it came from the cat it would've came from his butt since there is no fluid around it, which is grossing me out. I will be taking him to the vet, but I can't get him in until friday, I just need some advice on what this could be and what I can do in the meantime!
 PLEASE HELP!! 

All kittens have roundworms and need to be dewormed twice minimum, 2 weeks apart.

However some kittens seem to have them much worse and need more than the 2 dewormings.

Clearly yours is this way.

The worm may have gone for the cricket once swallowed, when your cat vomited the cricket, out came the worm.

Gross, I know.

When a cat/kitten has a large worm infestation they will vomit the worms up.

When given worm meds, it only gets the adult worms, which is why the med is repeated, for any unhatched eggs.

But since the worm's development cycle has a varied time line, it's tricky to get them all, so it takes many repeated treatments.

The vet who treated him for worms before won't charge you for each time he gets the meds now, only the first time.

Now it will be inexpensive as you will only be charged for the med itself.

Just a warning though, a big infestation can be dangerous because they go in to the lungs, causing obvious problems there, also sometimes when there are so many adult worms inside and they are all killed at once they are capable of causing a blockage internally.

There is really only 1 way around the cost and having to take him in for repeated treatments every 2 weeks, for possibly 3 or more months, and that is to buy a bottle of pyrantel liquid, which is very inexpensive, but-MUST BE GIVEN IN A DOSE THAT IS ADVISED BY YOUR VET.

Simply ask vet's opinion on this, ask if you buy a bottle and dose kitty every 2 weeks to save money and stress of repeated vet visits what he/she thinks and recommends.

This does need to be dealt with ASAP though!