Answer: bipolar disorder II (BP-II
Step-by-step explanation:
On the basis of this information given in the question, one can deduce that Tom is having bipolar disorder II (BP-II).
This is a bipolar disorder that isn't as severe as bipolar disorder l. In this case, the affected person may feel depressed which comes once in a while and starts having insomnia. The person may also feel sad and have an irritable mood.