Joel is correct and this would best be answered in the Stretching Forum. I have also moved your post about "Touching My Toes" to the Stretching Forum as it also would be better answered there.
I'm not quite sure why you want to lift your leg to head height? Are you able to kick to head height? Is this easy or difficult or not at all? As you said you have only been doing this a few months so give it time. If this is your goal then you will need to work at it properly.
In the Stretching Forum you will come across a book by Kurz that many have found helpful. This book is called "Stretching Scientifically" and you might also find it helpful. Run you question there and I'm sure there will be others that have run into the same problems that you are. Good Luck.
"IF I COME ... I'M BRINGING THE PAIN WITH ME"