"It might help to also know that I started the ACE weight loss pills so walking is the best way for me to not get jittery."
So many things wrong with this statement. Why are you throwing your money away on expensive unproven, unregulated pills? If you want to spend money wisely to boost results, hire a personal trainer and/or nutritionist. If the pills are making you jittery, why would you continue to take them. Do you enjoy that feeling? Do you have to take something else to calm down at night?
There are no magic pills or quick fixes. You can't go from 0 to 60 overnight. If you are so sore that you can barely move, why would you think it would be a good idea to walk 2 miles? How do you think you'll feel the next day?
"I still want to try to get in better shape and loose weight" You're not going to do it on your current course. It is a path to illness, injury and burnout. Sorry for sounding so harsh, but you seem like you need a wake up call.
Please ditch the pills. They are expensive, unsustainable, don't work long-term and could actually harm you if you have any underlying health issues. Check out the SP walking guide http://www.sparkpeople.com/resource/sparkwalking.asp to learn how to progress safely and sensibly. We cannot fix what took years to do in a matter of weeks. Be safe and be well.