I think it is time for a gyno check-up. Not that it is so terribly, terribly late for your period but because some of the symptoms you have named in your earlier post should be checked by a doctor if they are not easily explained (i.e., by something like pregnancy). The doc will do a blood test for pregnancy, which is more accurate earlier than a home test, and then will go on from there. Good luck!
I agree with Annie...make an appointment with your gyno. They can do the blood test and check for other issues as well. I am sure stressing about doesn't help either. I just think you will feel better once you see your doctor.
Best of luck
PS
My sister-n-law got pregnant....her husband had vasectomy years ago and it was truly his. The urologist even told him that it wasn't 100% and that it could happen. It was a joyous occasion for my sister-n-law because she really wanted a baby and her hubby was "fixed" before they got married. He had 2 children from previous so he was done...or so he thought. She had pretty much written off ever having one of her own and when she had weird symptoms...she thought she had the flu...LOL Anyway, all is well and my nephew is now 22!