Welcome back,..and I her ya on vegetarian vs vegan. I was vegan for years and for about two plus or so, I was having health issues and trouble with the linings of my intestines etc, and beans and leafy were not an option so I supplemented my diet sporadically w/ egg whites for protein and always felt ,"ehhhhh" about it. While I was training for the competition I recently did, my first and last as I am too busy to compete, but not too busy to train, I upped my protein thru soy and vega performance protein that I was able to finally give up the egg whites.
The 5 pounds will fly off,..they always do if you want them to (unless they are part of the dreaded last five pounds to lose)
As for being a trainer,...I am was..by degree in college and also many certs over the years, but never made my livelihood doing by choice...I was a working mom of three and I always did it here and there, but a most rewarding career path to help others achieve their goals. The downside is when you see clients in the grocery store that have cancelled on you the day before and avoid eye contact with you like the plague because they have ice cream and Oreo cookies in their shopping cart, and don't want to explain why they cancelled and why they have crap food in their cart. Good luck ..many good cert organizations out there, just do your research in the area you live first and see what most of the trainers in that area are being hired with, as it varies by gyms and private clubs as to what kind of certifications are preferred.