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Being a Diabetic, your Blood Sugar isn't under control at all. Your fasting must be as close as possible to 126 and after meal glucose
after 2 hours must be less than 140. You need to increase the dosage for sure. Also I hope you are not consuming high carbohydrate
diet like rice, idlis, dosas. Please keep carbohydrate diet to the minimum. Banana also a rich carbohydrate source. Stick to eating minimal of rice, more of wheat, more of pulses, cereal, green leafy vegetables. Yes, Bitter gourd has shown some effect in moderately reducing blood sugar values but nothing has been in standard documentation yet. Exercise everyday for 40 minutes with brisk walking. Consult your Doctor and get your drugs changed if he advises.