uterine lining 2.5cm thick?

Hi,I'm new to the internet let alone this site. I'm 48 y/o.Started my period at age 11. My periods have always been regular every 28-30 days.Lasting 5-7days. Approx. 5 mo. ago at night my skin felt cool and clammy so I thought I was having night sweats w/o the sweat. My skin and sheets weren't wet?  I have gained 10.5 lbs. since Dec. So of course I thought premenopausal. The last day of my last period was3/11/09-3/13/09. I went for my yearly 3/18/09.Upon exam I had excruciating pain over L ovary. Next day u/s showed marked dilated structure L fallopian tube and 15mm thickness of uterine lining. Gyno. put me on tetracycline for 14 days and follow up u/s on 4/30/09. I had them change it to 5/11/09 so it would be right after my period when the lining is at it's thinnist. Well I didn't start on the eleventh so rescheduled for 5/18/09 this one showed normal fallopian tube and 2.5cm lining thickness. I do have pain with intercourse,dryness,lots of presssure, urinating frequently-I used to go 2-3 times a day. Now10-12 x's and I still havn't had a period. On 5/13/09 I had all hormone tests including TSH and testosterone. They were all normal.Could this be something other than ca. Help! I go to Dr. 5/24/09.Signing out , insulin