Juvederm volift- side effects?

I had juvederm volift injected into the nasalabial folds and mid cheek. During procedure the doc ( oculiplastic surgeon ) injected accidentally a little under my eye, and wont admit too it, post injection for 3 days I had mild flu symptoms,constant pressure faint throbing around the eye area, temples and the area under the eyebrow and blurred vision. Day 4 all feels normal, but i' m scared, can symptoms return? Can the filler migrate to my eyes/ brain? Could i have vision problem/ blindness?