I have no personal experience with Lugol’s solution, so I went onto the search engine and typed "Lugol’s solution side effects." What I came up with suggested that there can be a burning sensation in the mouth, swelling of salivary glands and gums, a metallic aftertaste. If that’s what you are talking about, your experience may be somewhat normal.
If not, or, perhaps even if it is what you are experiencing, you could check back with the nurse in the surgeon’s office that prescribed it.