I would like to ask for some input on this strange experience:

One night while astral projecting I stumbled upon a strange plane because of a voice calling out saying, "can you hear me, help me". It was saying it over and over and is what actually drew me there in the first place. It sounded very strange as if it was very far away and it was broken like it was coming through with interference. I couldn't distinguish what the voice sounded like. It was almost monotone due to the interference. So I gatherd my psychic strenth and called back out to it. I said, "yes". It took a lot of effort and my voice sounded very strained. It felt like it was barely getting through. As soon as I finished projecting the word I suddenly felt something grab hold of me. Like something was constricting around me and I felt myself getting sucked into a vortex and felt myself spinning around getting pulled deeper and deeper and further away from my body. This is where I freaked out and tried to break out of it, but I couldn't at first. It took me some time to get out of it and it was not easy. It took all my years of experience in meditation to gather the strength and control to break free.

Has this ever happened to anyone?

This is just one of many things that I've encountered while astral projecting. It didn't stop me from practicing meditation but it did kind of scare me away from the whole projecting thing.

Yeah I've experienced that spinning sensation, but I really don't think you were in any danger. After all, we all leave our bodies every night. Sounds like a very profound experience though.

My sister is grabbed by her feet and is spun around in circles by this hideous creature, she calls "the elephant man!" She has been experiencing this for years... and she has lost complete control- and each experience as is scary as the one before.

Sounds like you opened yourself up to something that was up to no good. If it happens again, don't answer, don't even acknowledge it - something trying to get someone's attention and then trying to trap them doesn't sound benevolent.

I had a strange experience where I had a hard job getting back into the body once, when I eventually did return, I was nearly sick.

For sure, it is not all sweetness and light out there.

Thats The truth, I had one experience I'm having a real hard time forgetting. I think you have to be very aware, even in sleep. The first clue might have been the voice and all the interference, almost like it did not want you to recognize it...Lotus flower said if it happens again don't answer or acknowledge it and I say thats the best way to handle it. It's like my Mother always said, "some doors are just not meant to be opened" if you catch my drift...
Any way, sweet dreams.