How serious is a longitudal split tear of peroneus brevis tendon?

i have had pain and discomfort for over a year and a half from things as little as walking. im in the military so it took a while to get the mri done. it said partial tear of peroneus brevis and partial tear of soleus muscle. it feels as though my ankle is going to give out. should i get a second opinion (maybe its worse than it actually is but the military is trying to lessen it.) how long does it take to recover from surgery. is there a chance this can be a permanent problem.