You are in luck, because you can loose that thick neck by giving up all high fructose corn syrup. The weight falls away magically when you weed this vile stuff out of your life! And you don't lose in 1 area, but all over, including the hard to lose stomach fat! Mine fell away magically, 2-3 pounds per week. No more horrid binging caused by HFCS, which doesn't allow my appetite to shut off. (Yes, you have to read EVERY label all the way to the end because this stuff is everywhere.)
Like you, I had long brunette hair & kept a long white bob when i lost my color. Then I found a great hair stylist who gave me a short curly look. Some days I don't even bother to comb because it looks so great just from running my fingers through it. If your hair curls slightly when it is long, chances are that it will curl even more when it is short - like mine did.
I would never go back to a longer style! Shampoo & cream rinse last for years, it takes minutes to dry & always looks great. Ralph Waldo Emerson says "Always do what you are afraid to do." I think you will be very happy that you did. Good luck!