Low BF means low test, Test is a hormone strongly linked to reproduction. Low BF signals the body that it has to secure it's safety first, reproduction is of lower priority so low test levels. I would lose the food micromanagement for a while, you said it had become obsessive, take a break form this 'control-habit'. Eat good healthy meals 3-4 times a day, at 6'2" you should be able to get back at 210-220 (10-11% BF) fairly easy, with your training background. Take some extra protein, keep it simple, working out should be fun and eating healthy should and can be pleasant.