I am Type 2 diabetic, but my symptoms have been in check now for about 3 years, through diet & a large weight loss. About 1-1/2 months ago, I started exercising again (60 minutes on treadmill + some weights) 4-5 times/week. Last night while 22 minutes in on the treadmill, I realized I couldn't get a deep breath (my heart rate was good)...I got a bit panicky...had to stop exercise...still couldn't get good deep breaths & had dizziness. I drove home...seems a little fuzzy...ate something quickly, theorizing that I had low blood sugar. The food did help, but for a bit, I continued to have some dizziness & trouble drawing deep breaths. My error...I now realize that yesterday I did not eat much during the day (recently prescribed Phentermine to aid in weight loss) & went straight to exercise...all of which explains the low blood sugar. My question...can this low blood sugar cause the shortness of breath? At two different points last night, I thought I might have to call 911. I have also been diagnosed with COPD (never smoked) but it does not usually bother me - just have to watch my lungs if I take ill. Am at work this morning & feeling fairly well, although honestly, I still seem to be having some trouble drawing the deep breaths...the ones that reach deep into the lungs. Opinion?