This is my only means of income.

Varies year to year. I make anywhere from $25k - $50k. Made $50k last year.

The study I'm doing the outpatient for in Dallas (Covance/LabCorp) paid $13k. Stayed at the facility for 31 days straight. The study I did before this (Icon - formerly PRA Health Sciences) also paid $13k.

Most of these facilities list the studies open for recruitment, the compensation, and time commitment involved.

Here's an example: PPD in Austin TX

This website lists every clinical trial company in every US state:

I can't do opioid med studies, not because I can't handle them, but because of the "blocker" medication (like Naltrexone) that's usually given beforehand. Blocker meds cause me to throw up within 15min.

Back in 2011 though, I almost passed out while showering. The drug for that study was an anti-depressant.

A little. There's some studies I won't do just based on word of mouth experiences of other participants. I won't do any studies where the medication is treating Alzheimer's, and I'm a bit wary of those treating Parkinson's and schizophrenia. Had a roommate who did a study at Celerion in Arizona who did an Alzheimer's where most of the participants in her study, including her, became pretty sick. The med lowered their white blood cells, and they caught something. This was several years ago. In another instance, a woman in her 60s told me that the Alzheimer's med she took caused her to almost forget where she lived.

Oh, yeah. I absolutely won't do anything that has lumbar punctures where they take some of your spinal fluid. Those are rare to come by though.