I concur that you need to get professional help with this. Blood sugar fluctations are very serious business. Being too high and too low are both very dangerous situations. If your endo is not experienced in using diet/exercise to control diabetes, then perhaps you need to find another endo.

We've told you what works for us, but each of us may not have the same physiology as you. If your blood sugar was still 155 after exercise, that is an indication that your glucose tolerance is more impaired than you think. Has your endo had you do a 6 hour glucose tolerance test (and measured your insulin levels throughout)?