The main thing I struggle with is that when I try to go completely vegan, I get depression and joint pain. It's partly a "low blood sugar," type of feeling like you get when you reduce your caloric intake. But it sends my body into a yucky negative spiral where I feel too depressed to eat and then it gets worse.
I want to work with a nutritionist and develop a solid plan for transitioning in a healthy way so as to avoid this pitfall. I probably just need to plan meals rich in all the nutrients one could accidentally miss, including enough calories.
I don't know the laws in NY. but in California, anyone can call themselves a nutritionist. There are some good nutritionists in California but there are plenty of nutty ones. You want a Registered Dietician. It's not just semantics there are real differences. Although many people use the two words interchangeably - and the words mean different things in different countries. RDs have minimum education requriements from accredited colleges, meet criteria set by a governing body, and are re-certified on a regular basis.
I don't know if you need to work with a "nutritionist". For now, you can't go to see one anyway. So why not try to do it without one for now and then you can decide after the shelter in place is lifted if you need to see one.
You don't really need to pay anyone to "develop a solid plan for transitioning". There are any number of books and websites that have good plans already made. PCRM has the 21-day kickstart which is very good and easy to use. Dr. Furhman's Eat To Live has a good one in it too. I can't remember if Dr. Gregar's How Not To Die has one in it but he has the Daily Dozen checklist. You can probably get the e-books from the library, or order them from Amazon. The kickstart and the Daily Dozen are free and online. (I bet other forum members have some more good suggestions.)
I suppose if you follow a good plan you don't really need to track nutrients. But like I told you a week ago I am a big proponent of Cronometer. Tracking nutrients is not a substitute for a good plan, and I don't think it's essential. It's just a good tool.
The only meal plan I make is the one I make before I go to the grocery store. I use a chronometer mostly to make sure I get enough calories and protein.