If I took a high dose of lorazepam and novorapid (insulin aspart) could I die?

Please don't. Taking Insulin and sedating yourself at the same time is not advisable. If giving yourself insulin, you need to also eat. Death may not be the immediate result -- but the combination could lead to dangerous hypoglycemia. If you're looking for methods to kill yourself, you could be very depressed and need treatment. Please see your physician for evaluation instead.