Thyroid is in check. Not gaining actually losing a pound every few months. Gained the extra weight after a surgery four years ago and a lot of stressful shit going on.
Still have fairly decent muscle mass yet don't wanna see that turn into fat. Been trying to figure out things I can eat that will give enough energy without being totally exhausted or wiped out at every turn. Take calcium, b and a multi vitamin.
L-Glutamine would be a good help for starters. It helps with your muscle recovery and so you won't be as burnt out from exercise all the time. I'd take half a serving in the middle of your workout, and the other half directly after. Any GNC employee should be able to look at you and determine your proper dosage, but it should also say-so on the bottle. It's in-expensive, too.
I've never really dealt with someone who could barely walk without exhaustion. The first thing that comes to my mind is to upgrade your B-Vitamin to a "vitamin B-Complex" which has higher dosages of B's and includes all of the B's. Also,add in a green-tea extract supplement.
Next, I'd add either brown-rice, or wheat pasta to your lunch. (keep dinner roughly the same.
Drink lots of water throughout the day, and an 8oz. cup of (black) coffee in the morning.
These things should all help with your energy levels; in addition to a decrease in your red-meats. These take longer to digest and can make you feel lethargic, decrease your energy levels.
in-terms of exercise, it's always a good idea to do interval training when you're out to increase your stamina. that's short bursts of high-intensity (walking/running/swimming, etc. (choose your preference); followed by a really low-intensity thereafter. what this looks like is: walk hard and fast for 15-20 seconds, walk exaggeratedly slow for 15-20 seconds, repeat. It's hard for me to tell how long you can repeat this for, because as you mentioned you're in-pain. but so-long as you're doing a sufficient amount, coupled with an increase in energy-boosting foods/supplements in your diet, you should be able to build upon the walk to the mail-box and get yourself into some-more legitimate exercises, and the weight will come off even faster for you.
sound good so far?