Sounds like HPPD, but don't freak out. It happens a lot on these forums, with a whole spectrum of substances. It's only a disorder when you become fixated on it and resolving the problem. You just have to learn to live with it. It "goes away" when it ceases to be a problem for you, which can be weeks, months, or years, depending on how susceptible to controlling your anxiety. If visual distortions are really that much of a problem for you to deal with you should get your vision checked for astigmatism or other lens defects. Abstaining from other drugs (especially cannabis and MDMA) will help to a large extent too.
Eye 'floaters' are normal, just like persistience of vision, seeing negative afterimages with bright colors, halos around high-contrast edges, the background noise your eyes see in complete darkness, etc. You're not an ideal, infallible observer of the world. Moreover, seeing these is not an indication of brain damage. Even totally sober people experience 'tricks of the eye'. Read more about optical illusions and stuff on Wikipedia, it's really quite interesting...
Treatment of HPPD in the medical literature is usually based around anxiety management and therefore I do not recommend any pharmaceutical solution to this issue. Clonazepam has been used to good effect but it is an addicting, controlled substance benzodiazepine with effects of its own.
Snorting 2C-I is first off very painful and secondly a faster method of administering the drug. It will not change the fact it's a potent psychedelic stimulant.