Hi I'm Ronny and need motivational heeeeelp!!!

Hi all,
I'm Ronny, I started this on 08/26 and I already need help!!!
I'm 48, 5'7 and somewhere in the 150lbs. I don't know exactly where because I disgust myself so much I threw my scale away in my last move...The reason I put on somewhere in the 30lbs range recently is easily pinpointed through tragic events (the kind that don't go away) and the stress just became so much I started behaving erratically.
I use to be into sports a lot (well no Olympic athlete either but I was in the 110 to 120lbs range pretty much all my liefe aside from pregnancy and such events, but always went back to my 'normal" weight). I have years of jazz dancing, horseback riding, running track tai chi etc behind me so I know what to do I guess... it's just a matter of doing it. My life was turned upside down so much that I don't know how to live it any more... but I got the opportunity to get back in shape through a free gym (the little devil on my shoulder went "So what's your excuse now?" ...) and I did it. I hopped back on the treadmill and decided the goal was "to get back into shape". I didn't want to put "to lose 30lbs" for fear of doing what I always do which is start all gung-ho and then fizzle out. Which is exactly what's happening now!!! I'm hurting everywhere (my hips hurt to the point I can barely walk) and I got SICK! I caught the mother of all colds and stopped for 2 days... up until then, this is the program I was sticking to (give or take):
Monday: Rest day. No walking of significant distance or intensity.
Tuesday: Economy Workout. Warm up for 10 minutes at an easy pace. Then walk as fast as you can for 30 seconds or 200 meters (two city blocks in most cities). After 30 seconds, drop down to an easy pace for 2 minutes. Repeat the 30 seconds speed/2 minutes rest 8 to 12 times. Cool down with a 10 minute easy pace walk.
Wednesday: Recovery. Easy 3 mile walk at 65% to 70% of your max heart rate. This is a pace at which you can easily maintain a conversation but are breathing harder than at rest.
Thursday: Threshold Workout #1 - Speed. 10-minute warm up at easy walking pace. Walk fast for 8 minutes or 1 kilometer at 85% to 92% of your max heart rate. Then slow down to an easy pace for 2 minutes. Repeat this for 3 to 4 repetitions. Cool down for 10 minutes at an easy pace. The threshold pace is strenuous, but one you could maintain throughout a 10 kilometer/6 mile race. You will be breathing very hard and able to speak only in short phrases.
Friday: Recovery. Easy 3 mile walk at 65% to 70% of your max heart rate.
Saturday: Threshold Workout #2: Steady state or tempo workout. Warm up for 10 minutes at an easy pace. Walk 20 to 30 minutes at 85% of your max heart rate then cool down with 10 minutes easy pace.
Sunday: Distance Workout. 8 to 12 kilometers (5 to 7 miles) at 70 to 75% of your max heart rate. This is a conversational pace.

I have to confess maybe I pushed a little harder than that since I felt so good in the beginning... Daily calories put me at 1200 and I was doing 1000 or less easily, no suffering at all. I have a nutrition degree so I eat right. I know it's working as I've lost one size clothes, not sure what that translates to in weight as I can't weigh myself plus I usually don't.

I hope you guys can relate and tell me HOW you all stick to all this without getting totally discouraged!!!

Cheers!