Newbie to BT

I want to ask if it is allowed to use a snorkel in a race. It’s been almost a year since I have had two disc’s in my neck ruptured.
I come from the Dark Side as a presenter said to me a couple of years ago after a Duathlon race.
I did train 5 years ago for Tri but has to stop as chlorine and I don’t get along.
But due to my neck injury’s there have been complications causing frozen shoulder, just putting a t-shirt on can be painful. My stubbornness won’t let this take me down.
I was riding a fat bike during last winter while wearing a cervical collar, not too smart!.
I still got fat sitting around for 8 months while the drugs controlling the nerve slowly destroyed my life. I got smart and found natural alternative natural supplements that helped.
I am really would like to get back to racing after having two very good years in a row.
Sorry for the long post.
Oh, I did return to the pool and found it very helpful in fighting off the adhesive capalitis. I am certain I could easily do a Tri, but have limited neck movement.