I don't think there is an actual scientific name for it, but i would suggest toilet phobia.
Going to the toilet is a biological necessity. -------> yes
Because one "toils" there.
I would call it isolosomniphobia- isolophobia is fear of being alone, and somniphobia is fear of sleeping. You seem to have a mixture.
Pirates commonly referred to the toilet as the "head." This term originates from the location of the toilet on a ship, which was typically at the front, or "head," of the vessel. Using nautical terminology, they would say they were "going to the head" when they needed to relieve themselves.
No, he goes down the sink
crapopoop
Toilet
A bathroom is called a bathroom in Ireland. What is meant when you say "Bathroom" in Ireland is a room that has a bath. In some countries, it can mean a room that does not have a bath, but does have a toilet. Some countries are a bit uncomfortable about using the word toilet and so they use the word bathroom even when it does not have a bath in it. There is no problem about using the word toilet in Ireland, so a room without a bath, but with a toilet in Ireland is called a toilet. In Ireland, calling a room a bathroom when it does not have a bath in it, does not make sense. If there is a bath and a toilet in the room, then it is called a bathroom. Even then, someone might say they are going to the toilet, when their intention is to relieve themselves.
Scolionophobia- Fear of school
LOLthis is going on failblogAlternative answer: Yes, I am a toilet. Thank you for taking the time to ask.
Toilet
'Bog' is a slang term sometimes used in Britain for a toilet.