It sounds like it's worth it to get tested. You may get diagnosed and be afforded some accommodations pretty quickly if you can see a doctor about it. I saw a psychologist for this for years. But there's a kind of formal test that a lot of universities require for a proper diagnosis. This can be a very expensive, time-consuming procedure. You need to call whatever facility is available to you and ask how much it will cost based on your insurance.
This knowledge comes from my personal experience! I was diagnosed with a disability such as this 3.5 years ago by a psychologist. I was afforded accommodations as the Disability Services department at my university saw fit based on my diagnosis. I was recently informed that I would need the full, proper test done in order to maintain my status as having this disability and that it could cost me upwards of $1000, depending on my insurance. They also mentioned that this option was even cheaper than getting it done outside the university as external clinics may charge 4x as much! Take this all with a grain of salt. Also, if it helps, this was as an undergrad at a Massachusetts state school.
Anyway, I think that if you can, you should go see someone! It might not take as much time as you realize (maybe a long time in between calling and getting an appointment, but the appointments themselves aren't necessarily long... except for that one "full test" thing I was describing, that takes hours). It might help to call your school's Disability Services department and ask what steps to take and what resources to look into. Good luck!