You're asking for a self-pitying slap, John.
*Slap!*
There's many people on here who've overcome feelings such as yours, not to mention illness and injury. Providing you're able to run physically, the rest is mental. Get your head in gear, then get on the gear ;o)
Get out there for a 'no pressure' jog - and if you don't feel a better person for it afterwards, then come back here for another slap.