Hello,
It sounds as if you have some straining of the muscles in the lumbar area. If the symptoms are mainly when you stand or walk, it could be due to the weight and weakness of the abdominal musculature. Most people don't realize how important the abdominal muscles are in supporting the back. If these muscles are weak and there is excess weight that pulls on the back, you can get chronic back discomfort.
For your height and weight, your Body Mass Index (BMI) is 39.2. Anything over 30 is considered obese, between 25-29 is considered overweight.
You can calculate your BMI at http://www.nhlbisupport.com/bmi/
I would recommend some short and longterm treatment:
Short-term: try tylenol or ibuprofen (if you have no problems with either medication) to help relieve the discomfort if you stand or walk for extended periods of time.
Long-term: it is difficult, especially if you already have back pain with standing/walking, but begin a diet and exercise plan to get your BMI down below 30 (ideally 25 -- but that may be too hard of a goal for now). It is also important that along with weight loss, you work on strengthening your abdominal musculature to better support your back.
Take a look at the following websites to get more information on what you can do to help your back discomfort:
http://familydoctor.org/117.xml
http://www.spine-health.com/topics/conserv/easyexercise/easyexercise02.html
I would also recommend seeing your primary care physician for a thorough evaluation and consideration of xrays. Degenerative disk disease affects a significant number of people afte 40 years of age. Imaging of your back will help determine if this is truly muscular or there is some vertebral component to it. There are also many other things that can cause and contribute to back pain.
Your doctor may also determine if you need muscle relaxant medications to help with your discomfort.
Irregardless of what your physician determines, it is still important to keep in mind that losing weight with a good exercise and diet plan will go a long way to keeping your back and the rest of you healthy. You should also discuss this with your doctor.
I hope you find this information helpful to you. Please indicate so by clicking "Accept" and providing feedback. A bonus is always appreciated.
FamMedDoc