Hi isjoberg
Sorry to hear about your long lasting hypo, I have had similar episodes in the past. I once had a hypo which just didn't respond to lucozade, energy bars and assorted fruit for the best part of 2 hours. I had been hiking in the Peak District for some time in very muddy conditions but had eaten extra carbs whilst walking but still had a very long unpleasant hypo and like you felt awful for many hours afterwards. In those days I was on basal / bolus regime (novorapid & Lantus). For the last six years I have been using a pump and I'm pleased to say that I have had no such severe hypos since despite still exercising regularly. The big difference being the ability to alter my basal rate prior to and during exercise. The big problem with long acting insulin is that once given there is no ability to adjust anything other than eating more carbs which often isn't easy during an exercise class.
I really can't recommend pump therapy enough especially where strenuous activity is involved, it makes glycaemic control so much easier. If you think that may help in your situation it may be very worthwhile speaking to your local diabetes clinic. All the best