All sorts of things now

[valleyplayer42]

Woke up 3 days in a row with a headache, took 2 advil right away, gone in 20 minutes not even.

Stomach pains last night when laying on right side for a few minutes then fell asleep. Woke up this morning, with an awful come  and go stomach ache / pain that makes me want to curl up in a ball and cripple up.

Nasty head congestion and nose congested for the past week.

Took a ferrous gluconate pill last night IRON supplement... not sure if i was that or the left over chinese and pizza I had yesterday throughout the day. Or if is just something invading my stomach and deteriorating it from the inside out, like a cancer, or a parasite.

[mollyfin]

Iron supplements cause stomach pain and upset in a lot of people.  My girlfriend discovered that the brand called Slow FE (i think) is easy on the stomach.

[Slangevar]

The congestion explains your headache (it would be worse in the morning, since you've been sleeping all night with mucus building up in your head).  And I agree with mollyfin that either the iron supplement or the food could cause the stomach issues. (If I even think about Chinese food, I get gas.) 

You answered your own post!

[sassparella]

Almost certainly the iron pill or the chinese and pizza that caused the stomach ache.