My friend doesn't seem too healthy lately. He says he keeps getting bad headaches, along with what he describes as low blood sugar even a couple of hours after food.

Basically:
-Digestive system problems (too regular, I gather)
-Headaches
-Exhaustion
-Inability to visually focus
-Shivering/shaking (almost feeling like seizures) "not the cold kind"
-Weakness in limbs: sometimes feels like he can't even walk, or might collapse.
-"Feel like my stomach is gonna die", "Almost anxiety, but different"

In the past he's complained about joint pain, even tendon swelling once, which seemed along the lines of arthritis. He's taking prescription ibuprofen right now for that and back pain which he thinks is to do with his bed (he sleeps in a dorm at college)

So I wonder if anyone has some idea what this might be? A friend who's a nurse says it might be Hypoglycemia, but I need someone to help me convince my friend to see a doctor sooner, 'cause I'm worried. =/