Omega-3's shouldn't be taken with blood thinners. That would be the main reason to consult your regular doctor.

But they are FOOD you know... not a vitamin or supplement.
If you eat enough fish and flax seed, you don't need to take it as a supplement. But many people don't, so then there are pill forms.

Eye doctors are giving them now for various eye inflammations.
That is a relatively new treatment, but there is a study on PubMed by the Basel drug company using it for eye twitching.

3 a day of regular fish oil is not a high dose. And it may be really helpful for you. You can use Krill oil instead.. we use one double strength MegaRed now instead of fish oil. I also eat more salmon than my husband does. Magnesium helps fish oil to get metabolized properly by the body.