When I was having a bad run of hypos last year I found that when I was stressed and run down, the after-effects of a hypo (which usually left me feeling rubbish for up to 24 hours) could drag on for several days of just feeling strange and short of breath, with sudden fatigue. It may be that in your case the stress of going to university is exacerbating the shock to the system that the hypo can cause (and 'shock' is the operative word), and hence prolonging the after-effects. I shouldn't think there's any nerve damage, but if symptoms persist it might just be worth having B12 levels checked (in my case that seems to have been the basic problem, which hypos intensified).