Organised by human rights charity Reprieve, Bey begins his treatment by changing into an orange jumpsuit and being chained to chair, before having a tube inserted into his nose.
The upsetting footage shows him fighting the nurses administering the procedure, screaming, shaking then pleading with them to stop.
He then breaks down in tears.
"I really didn't know what to expect," he said afterwards.
"The tube went in and the first part of it was not that bad, but then you get that burning and it starts to get unbearable - it felt like something was going into my brain. I really can't take it."
The makers of the video claim what was used on Bey was standard operating procedure for force-feeding prisoners hunger striking at Guantanamo Bay.
104 of the 166 prisoners in the US prison began a hunger strike in February in protest at the conditions.
More information on the procedure can be found here.
* Watch the video here (warning: explicit content).