Thank you so much, everybody, for your replies!
Here's why I asked-
I became a vegetarian 2 years ago, for ethical reasons. I still eat dairy and eggs, but no gelatin or anything else that is part of an animal's body. Anyhow, the last two years have been the most unhealthy of my whole life. I don't know if this is a direct result of my diet or just a coincidence.
In two years, I have:
-gained a large amount of weight. My frame is not suited to heaviness and I feel like I am wearing someone else's body. Diet and exercise have helped me maintain my weight and very slowly lose a few pounds here and there, but trying to take the weight off has been a nightmare.
-had absent or incredibly irregular periods, ranging from intensely heavy to barely there. Some as short as 2 days and some as long as 3 months.
-lost at least 50% of my hair. Fortunately, I had very thick hair to begin with, so no balding- yet.
-been incredibly lethargic. Not depressed, mood-wise, but just sooooo tired and lazy.
-had nerve problems that come and go. Symptoms include tingly feet, hands, arms, legs and occasional numbness or dull ache in all of those.
In the last 6 months or so, my doctor has checked my vitamin levels (normal), my thyroid (fine), checked for diabetes or insulin problems (no), induced periods and finally made a tentative diagnosis of PCOS. I have been treating the PCOS with hormonal birth control (with some success) but not all symptoms are abating.
I eat pretty well, though I do eat a good deal of meat analog stuff. I include lots of tofu, beans, nuts, eggs etc in my diet. I am pretty sure I get enough protein. I eat a variety of fruits and veggies. I do eat a lot of carbs, but not more than your average person, I don't think.
I have been taking a LOT of supplements, just to make sure that my bases are covered. I have always taken a multi-vitamin and extra Vitamin C. When I went veg, I added flax oil (for fatty acids) and B-12. In the last month, I have started taking Saw Palmetto for the hair loss/hormonal issues, iron and a B Complex. I am concerned that all of this is caused by a nutritional deficit of some kind. It all just lines up, time-wise, so perfectly with my becoming a vegetarian. I did not have any of these issues before that.
I wondered if anyone else had similar thoughts.