Hi, Becci, and welcome! Ahhh.....floaters. I have a lot of them. I don't think they are related to fibro but what they are are cells that are floating around in the vitreous fluid of the eye and you are seeing them. When I first got a few, that's all I was seeing. Now, I rarely notice them. I have some that are dark and I used to swat at that "invisible" bug I was seeing.
You are young to be having this so I do suggest you see an optholmologist. They are specialists for the eyes and have more education that an optomitrist. Floaters can also be caused by inflammation in the back of your eyes or even retina problems. Your vision is too precious to mess around with plus the visit can give you peace of mind.
Here is a link from the Mayo Clinic about floaters.
http://www.mayoclinic.com/health/eye-floaters/DS01036
Some days I can see better than other days. I think it has to do with barometric pressure and sinus for me. It almost seems like my eyes are "congested". I know that doesn't make sense but that's the best way I can describe it. This is another thing an optholomogist can help you with.
I'm not sure why you have the falling feeling when you first lie down. Some fibromites do have vertigo and this could be a symptom of that. Perhaps it, too, is sinus but I would discuss it with your doctor. There probably is a simple answer to it but I don't know what it is. Bottom line...don't get stressed. Just get checked out. It does ease the mind and not everything is caused by fibro.
Be sure to read Fibro 101....the first thread on the forum. There are links to good info about fibro and you will learn a lot there. Good starting links are called Symptoms and A Thorough Explanation of Fibromyalgia. You just might see yourself there.
I'm looking forward to getting to know you better. Don't hesitate to ask questions because we are here to help you. Hope to hear more from you soon.
Sherrine