Sorry to hear about the struggles with pain. Taking 3-4 months off for recovery seems tough, but many have done similar. Take the time and get better. You have a ton of life in front of you.
Would a Mountain bike offer any relief? Different riding position/posture. Getting out of the saddle for climbing, dragging your butt off the back of the bike on descents?
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I think its disgusting and terrible how people treat Lance Armstrong, especially after winning 7 Tour de France Titles while on drugs!
I can't even find my bike when I'm on drugs. -Willie N.