Hello ClaytonP and well doen for reaching out and asking, this can be a challenge for all of us, wherever we are in life. So, if I were an employer, first and foremost I would be looking for good, reliable workers. If a worker has any problems, is it a managed problem. So if someone has poor eyesight, and does not wear glasses, this is going to be a problem. If however, they wear glasses and the problem is now a managed problem, from an employer perspective, this really does not matter one way or another.
Same with whatever health problems that you may have, are you able to manage them? So you may need to be within easy access of a toilet and use the toilet more, if so then this is managed and would be worth raising. You could be casual around the terminolgy, just say that your insides can sometimes be a little lively and to manage this, you just need easy access to a toilet. This would a reasonable thing for an employer to provide, if they cannot provide this, they may not be a good employer, and you may be better looking elsewhere.
In terms of career choices, the possibilites are huge, and often opportunites come from where you least expect them. Stay open minded. I work in a hospital engineer. I work hard, my employer appreciates this, there are numerous toilets all over the place, which are very clean and spacious. I never sought this job, I just responded to an advert that a shift engineer was required. At the interview, they advised that it was at a hospital.
It is natural to be nervous. Like anything, the more interviews that you can have the better you will get at them. Definetly, definitely see if you have the opportunity to undertake any mock interview, with feedback, then take them!
All the best!