Don't just avoid 'alcohol' in terms of beer/wine/spirits - avoid Kombucha, zero/low alcohol, foods and sauces that say 'wine', 'rice wine', 'sake', 'mirin', 'beer batter' (as they may still have traces if not more - boiling a dish with alcohol doesn't get rid of it, despite what some people claim), Vanilla and almond extract, vinegars, soy sauce, teriyaki sauce, a lot of fizzy soft drinks, tiramisu, Rescue Remedy, and make sure your mouthwash states alcohol free.
If you don't, you will feel horrendous.
I didn't need to take oral Metronidazole for as long (different condition) but whilst I stuck to the rules rigidly and felt fine - despite being one of those people who are generally either chucking my guts up or outright allergic to antibiotics - somebody else I knew later on ignored all but drinking beer/wine/spirits and constantly complained of how terribly ill he was.
Like I said, though - by avoiding all of those things, I didn't have a single side effect. So it was worth it.