Final answer:
The individual's symptoms suggest bipolar disorder, a mental health condition characterized by extreme mood swings. They should seek professional help for a proper diagnosis and treatment plan.
Step-by-step explanation:
The symptoms described, such as insomnia, poor appetite, dizziness/nausea, and paranoid thoughts, along with marked fluctuations in mood, are indicative of bipolar disorder. This is a mental health condition characterized by extreme shifts in mood, energy, and activity levels. It is important for the individual in question to seek professional help and receive a proper diagnosis in order to develop an appropriate treatment plan.