Day 21, will I make it?

Tomorrow will be day 21 without smoking.  It has been going pretty good, that is until Thursday when I woke up with sciatica pain, this is not abnormal, I will occasionally do something and cause pain in my lower back and shooting pain down my leg.  Anyway, I decided I would still exercise, so off to the elliptical machine and Zumba I went. Maybe not the best decision, Friday at 1am was in the ER,  the pain was so intense,  no matter how I sat, laid or stood there was no relief.  I did however, find out that kneeling allowed some relief, but I had to tell every worker when they paused at the door to my room that I was not praying and they could come in.  While there my foot became numb with the pins and needle feeling, today is Sunday and for the last three days I have had  numbness from my toes up to my butt cheek, my leg and foot are now swollen and I still cannot sit on the couch in a normal sitting position.  I'm not sure what the swelling is from, hoping it is not a blood clot and I'll make an appointment on Monday to see my doc, Thursday I have an MRI scheduled for my back. I have not been able to exercise for the past 3 days and relief does not seem to be in sight, so what do I want to do?  That is right, I want to smoke, without exercise all there is, is food, which leads to weight gain, which leads to me smoking, so why wait, and let me mention, I was healthy as a freakin horse umm lets say 22 days ago. No sciatica pain causing middle of the night trips to the ER, no numb and swollen leg, no lethal blood clot slowly making it's way to my lungs (exaggeration, possibly).  But no worries, I will power through and not smoke, that is until I can prove I have a deadly blood clot, at which point smoke em if you got em :)