Terry's nails

I saw some pictures of "terry's nails" and think I might have them. I'm worried because i've read it is is a symptom of serious systematic problems. Is there a less serious reason for the appearance of 3/4 of my nail beds to be pale and the edges to be darker pink?

I also get dizzy and feel faint, have low blood pressure (88/53 at times but other times it's more in 90/60 range). I'm 26 year old vegetarian female, 5'2 and 103 pounds, I eat lots of veggies and protein but used to have bulimia for about 2 years, but have been completely recovered for at leat 6 months. I also haven't had my period in almost a year since stopping birth control pill. My doctor said I had polycystic ovaries (had ultrasound) but don't have other symptoms of PCOS. Other symptoms: very thirsty, low energy, depressed, lightheaded for extended periods of time, worse in mornings and everyday, having to wake up in the night to urinate.

I have been taking Iron supplements for a few months and still taking them for low iron. Also taking B supplements. I was taking multivitamins but don't take them everyday now because I think I have a pretty good vegetarian diet. I am trying to gain weight as well and not exercising as much in the last month or 2. I used to weigh only 90-95 pounds but have already gained weight in the last year.