I live in Key West FL and several of my friends are experiencing the following issues
HI, thanks for using Chat Doctor Allergies can cause a range of symptoms but are not normally associated with the symptoms mentioned. He should be assessed by his doctor. This would include a physical and psychological assessment. Included in the physical assessment he may need a complete blood count and thyroid function test since anemia and hypothyroidism can cause fatigue and problems concentrating. A psychological assessment may also be included because of the mood change. I hope this helps