Definitely get a second opinion but don't wait too long before doing it - better to be safe than sorry as parents always say... I currently have 3 different doctors on MY books that I see - mostly just the 2 but the information you get from them can differ so much it's crazy! 2 of them are totally pro-Vegan especially when they see the difference it's made in my health. I don't know much about the problem you've been advised you have but it does sound a little odd. Everything (except animal derived products!) in moderation is always a good rule to stick by but not everyone is the same. Sorry i'm so vague but it IS Saturday night and I did stock up on wine.... Good luck though!!
Good luck though!! 
