i'm sorry to hear you're experiencing this. the good news is it's probably not serious. if this were appendicitis the pain would be on the right side not the left and it would be pretty ouchy. it likely wouldn't be something described as "mild pain. " sometimes when a person becomes active as you have they get very in tune with their body -- and that can magnify their perception of even minor changes twinges in their state of being. it's not unusual for a person to experience minor aches and pains throughout any given day. it could be you simply never noticed these things before and now you do. another possibility is gas passing through the large intestine or even a piece of hard stool moving along. these situations can produce a mild pain in the left abdominal area. the fatigue and lightheadedness could be mild dehydration or (as you suspected) some sort of fluctuation in your blood sugar levels. if the pain persists or if you develop a fever then you should see a doctor. and by the way keep up the great work with healthy eating and exercising. it sounds like you've really been making an effort. wishing you well!
i have a mild pain on the left side of my stomach along with fatigue and lightheadedness. . i'm also slightly thirsty though i'm usually that way. to my knowledge i don't have type 2 diabetes. i'm 15 weigh 205 pounds and have previously lost 25 pounds. i recently took a small break from eating healthy and exercising however but have gained no weight. i think it could possibly be appendicitis but i'm not sure.