Over Exercising?

Over Exercising?  Guilty, Guilty, Guilty.... I've been exercising since I was 22, I'm now 51.  In my 20's I did high impact aerobics which lasted an hour.  I would say 30 minutes of the class was aerobic and 30 minutes was leg lifts and sit ups or arm weights and sit ups.  I was content because I had a job where I walked for 8 hours a day.  In my 20's sugar didn't pass my lips.  My diet was sparse.  I would probably say it was close to being an anorexic.  My supper would be a can of vegetable soup and my snack would be hot air popcorn and diet tea.  I kept this diet until I got pregnant with my first child.  I remember being 8 months pregnant thinking I should treat myself to a milkshake.  All those years of dieting, I would never even consider a milkshake.  Now I'm 51, middle-aged, thyroid cancer survivor, and bi polar.  IF MY METABOLISM WAS ANY SLOWER I WOULD BE DEAD.  I got exercise fever this past Jan of 2014.  Before that I was riding my bike outdoors or walking the lakes at LSU but the problem was that I wouldn't sweat.  In Jan I found the the biggest Anytime Fitness in the area.  Every treadmill, elliptical machine, and bike had a tv mounted on it.  I was hooked.  I started walking an hour on an incline of 6 at a speed of 3.8mph.  I pushed that up a few months later to an hour and fifteen minutes, then a few months later I pushed it up to an hour and a half on the treadmill still at an incline of 6 at a speed of 3.8mph.  Recently I added the elliptical for 30 minutes.  So my lastest routine is 1 hour and 20 minutes on the treadmill (I could easily walk 1 hour and 30 minutes) but for now I'm just walking the hour and 20 minutes which burns 719 calories,  I burn 300 calories on the elliptical which makes a grand totak 1019 calories burned, WHICH IS RIDICULOUS.  I just saw my Endogrinologist last week and he was grinning ear to ear.  He was so proud of my weight loss which was 43lbs since Jan but 58lbs since Thyroid Cancer 9 years ago.  My doctor told me I couldn't get any healthier and that if I were to lose more weight he would be purely for cosmetic reasons.  I want to keep my doctor happy and I wanted to prove that I  could lose even more weight.  I don't know where to cut out on my food intake so the only thing I know how to do is Over Exercise.  My daughter who is a personal trainer told me I had to start using weights but I'm hard headed, the only thing I can focus is how many calories I burned.  I have a plan if I could only do it.  My plan would be to walk an hour, elliptical for 30 minutes, then 30 minutes of weights which would give me 820 calories burned and not the 1019 calories I want.  This blog was wrote a few days ago.  I just got back from shopping for clothes.  Since Thyroid Cancer I have gone down 3 dress sizes and 3 pant sizes.  Oh, My, God.... UNBELIEVEABLE!!!  Stay Tuned~Desiree Cart Dugas