Hi sweetd..., I'm so sorry to hear about your boyfriend. As mrfoot56 already mentioned there are plenty of reasons that can explain those symptoms. Could you provide more details, for example: Sleeping difficulty? Nausea? Dizziness? Weight loss in the past few months? Appetite ? etc
Potential health problems your boyfriend should discuss with his doctor: anemia, hypothyroidism, sleep apnea or maybe those are just symptoms of a common cold (flu).
Here are two links that might be helpful :
http://www.wrongdiagnosis.com/symptoms/fatigue/quest... http://www.webmd.com/balance/features/your-guide-to-... Hope to hear from you soon, I wish you and your boyfriend the best !!