It's normal to get weird sensations as the treatment starts to work, that's were all the patience comes in when you first start Vaginal Atrophy treatment, and it's the time when it's all trial and error. Patience is the key here with a good feminine moisturiser to help tolerate any side effects of the treatment.
Twice a week treatment is totally useless for most of us, I only started to reduce mine a year on from daily doses of Vagifem and Ovestin and still I need to use it daily. It's all a learning curve and you will soon find out for yourself what regime works best for you, we are all so different and what works for one will not for another! Good luck ladies!