Another incidence of the muscle spasms /wierd ER head thing

Began 09/16.
To go into a few details:

I was constipated beginning 09/15.  It was odd but I didn't think much of it.
Day of 09/16 - Was doing perfectly fine.  Took codeine along with Neurontin, something I had tried out the last two days.  Around 4 pm, got really nauseus, threw up, and then also had all this pain relief throughout my body, but sick feeling.  Figured that it was due to the Codeine, a side effect of Codeine is nausea, but I had taken Codeine the day before and not had nausea.
Head started really hurting, enough that I was vocally going 'ahh, ahh', and staying out of light from the TV.  I was nauseus.  I forced myself to eat a chocolate bar and I felt better a few hours later and went to sleep.  I woke up at 6AM which is strange for me.

Currently- getting muscle spasms, ow!  Not very nauseus, but a little.  Definitely not getting that rushing feeling which is also pain-relieving.

I'm getting tested for Variegate Porphyria today.. hope to heck that it IS so that I can get a diagnosis!.

If not, then WHY AM I GETTING MUSCLE SPASMS INTERMITTENTLY 


edit: I am not on birth control so its not that.  I didn't change my meds significantly.. I did try codeine, could that have been the culprit?  But, I didn't have codeine the other two times it happened this year.

EDIT: Test for Porphyrins was negative, so its not Porphyria :(