You went to Gym at 9am without taking breakfast.As your stomach was empty,and after 1 hour of exercise your Glucose
levels has come down.So,you felt tired.You developed Hypoglycaemia
Please do not get afraid .
As per the literature,you should eat something in the morning.After 2 hours,you can start exercising.
you can even exercise in the evening too.It is advised by majority of experts now a days.
You start exercising under some expert/trainer's guidance.
Losing weight is a gradual process.
Wish you good health and All the best