A lot of exercise (both cardio and strength training/weight lifting) will help anyone lose weight in combination with reducing total calorie intake. People have been misled into thinking that 30 minutes of exercise is good enough but this is simply not true. Our bodies were made to move and if you are not getting at least 1 hour of exercise daily, you are setting yourself up to gain weight particularly as you age.
In fact, especially if you are female like me, you will only MAINTAIN your current weight with just an hour of exercise daily. Doing less exercise will likely not get you anywhere with regards to weight loss. Moderate and high intensity exercises will get the weight off quicker than long lower level intensity exercises. While you should only push yourself as far as you can comfortably go, keep in mind that if you're able to hold a conversation or sing with only moderate to little effort, your workout will not help you lose weight quickly.
Secondly, reducing calorie intake is important to losing weight. It can be difficult or inconvenient but it is necessary to losing weight. As we age, our bodies actually need FEWER calories than we needed in our teens, twenties, thirties, etc. A common issue is that we continue eating as if we were in our teens long after those years have passed.
Stress affects our weight by producing cortisol which tells our bodies to store fat around our abdomen area in particular. In addition, if you are not active enough you will only gain weight in this area even when you aren't stressed. Throw in the fact that no one can spot reduce (without liposuction) and it's easy to see why many women get frustrated with their midsections. It is important to know that vigorous exercise will make a huge difference in your midsection over the course of 6 to 8 weeks in combination with a healthier diet.
In conclusion, try to get a total of at least an hour and a half of exercise daily if not two at the most. It does not have to be all in one long session and can be broken into two or more smaller bits. Reduce your calorie intake to 1200 - 1400 calories daily with your food choices consisting of mostly lean proteins, vegetables, fruits, nuts, and healthy oils. Visit your doctor and tell him your concerns about your weight. Only your doctor can take into account your current level of health and any meds you may be on and provide you with information that will help you get to where you want to be in a safe manner.