How to get diagnosed?

If you think you have an illness, how do you exactly bring it up with your doctor? Do you just flat out ask?

The reason I’m asking, is because I’ve always heard of fibromyalgia, but never knew what it was until an hour ago after trying to figure out why my body has been reacting the way it has. I’ve read several articles and with everything I’ve looked up, I have every single symptom of fibromyalgia. And it seems like my symptoms are getting a lot worse. I can barely do anything without having to take a break. At night, the muscles in my back feel like they are being twisted. I’m not sure if it has anything to do with it, but I have Raynauds Syndrome and it has gotten 70x worse within the last few months.

I have a few mental illnesses that make it hard for me to ask questions and word my sentences right. I start thinking in my head what to say and nothing sounds like it would make sense. I can be anonymous when I ask on here, so it makes it a tad bit easier. Or I think it does, sorry if my post is jumbled any or if I’m asking in the wrong forum.