I guess it comes down to whether you're being a vegetarian to make other Buddhists happy, in which case the above advice applies, or if you are being a vegetarian for your own beliefs and health, in which case you make the decisions, not some meat happy monks who don't seem to understand the similarities between killing yourself and contract killing, ie buying from the supermarket.
18 years ago I made one of the most important decisions of my life and entered a local Cambodian Buddhist Temple as a temple boy and, for only 3 weeks, an actual Therevada Buddhist monk. I am not a scholar, great meditator, or authority on Buddhism, but Buddhism is something I love from the Bottom of my heart. It has taught me sobriety, morality, peace, and very importantly that my suffering is optional, and doesn't have to run my life. I hope to give back what little I can to the Buddhist community that has so generously given me so much, sincerely former monk John