Uterus lining?? Help

I went to the doc on 11-11 and they said my lining was thin was alarming at the time. Went to the doc today and it was still thin. No period in November and still no sign. My endocrinologist ordered blood work and they did a U/S. They found one cyst on my right ovary & they want me to get a sonohysterogram. I'm scared I'm just hoping they treat me so o can get pregnant...Has anyone experienced something like this??? I would appreciate your comments.