Obsession is just a word that lazy people use to describe dedication. Yes, what you are doing may be eccentric. If it is destroying your life in some way, causing you to quit your job or not being able to function well in outside society then yes, you need help.
Caveman, the fellow whose picture you see flashed around here all the time said the following. "I can tell you exactly what I ate 5 years ago"
Pen and paper tracking sucks however, it is time consuming and annoying. There is an open source computer package called NUT, seach for it on sourceforge or whereever, it runs on DOS and UNIX. It uses the USDA database to give a full nutrient profile of each food. You can add typical meals etc. In short, you can track 137 nutrient variables with a few button presses, it is very quick and easy to use. The author is very helpful, and answered my questions regarding entering undocumented food.
As was correctly pointed out, you need sleep, reduced stress, etc etc to truly meet your physique goals. However, accurate nutritional tracking is not a bad thing at all. It can be fun, especially with a good software package, such as NUT (which is free and the best you ask for). You can learn to prepare your meals very quickly, know exactly what is inside them, even faster than the average citizen (especially if its mainly clean food).
The fact you find it necessary to post regarding this however, indicates that you have a problem. The fact you listen to people who tell you that you are nuts, also indicates you have a problem.
In short, nutritional analysis is good. Note the use of the word nutritional analysis as opposed to calorie counting (which is very gay, gayer than Richard Simmonds).