Hi, AUNTBEFF ! Perhaps you're trying to do too much too soon. Like Coach Nancy said, start out slowly even if it means you're only exercising for 5-10 minutes. If walking for 30 minutes seems like too much, then break the walks up into shorter segments. Walking for 10 minutes three times a day still add up to a 30 minute walk. but once again, if all you can do is 10 minutes, that's okay. that's where you start. Your strength and endurance will increase with time and regular practice.
Now, do you feel pain when walking ? Are you wearing good walking shoes ? Don't wear old shoes. If you're going to walk, you really should have good shoes that support your feet. Wearing old shoes can cause a person pains. So, do try to get fitted for a good pair of walking shoes if you're going to walk.
Also, if you find it difficult to stand for long periods of time, how about doing exercises while sitting in a chair ? If you go to youtube and do a search on chair aerobics or chair exercises, you'll find some short workouts you can do with your upper body while sitting in a chair. that might be a good activity for you to do.
Mostly, you do the best you can. If you can walk for 10 minutes without any pain, that's how long you walk. There are members who lost 100+ pounds just by walking and watching what they ate. some of those members could only walk to their mailbox and back. that's where they started. You should read INDYGURLs blog in the Daily Spark. I think you'll find her story inspiring. www.dailyspark.com/blog.asp?post=the_first