Couple of things: I find that vegans heel SLOWER than not, on avg (just some FYI). Sure, it could have healed (but not in 3 weeks). Again, depends on the size of the tear (among other factors) on whether I would rec surg. You saw someone and he did, so for now, stay with the only person qualified to give you a real answer! Now, nothing wrong with another opinion of course.

edit: just saw your posted MRI. You do have some peroneal thickening/fibrosis just behind the lateral malleolus, but you only have about 3 sagittal images there showing the peoroneal(s) (really need to see the whole exam, T1/T2 weighted images, etc.) to really get some more info.

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Fatigue is biochemical, not biomechanical.
- Andrew Coggan, PhD