I have been taking a gh releaser, sermorelin, for a week. I have had moderate side effects including headaches, flushing, dizziness. What causes this?

Ask your doc! Sermorelin is generic geref which hasn't been sold in states since 2008 (http://www.Fda.Gov/downloads/drugs/drugsafety/drugshortages/ucm086077.Pdf). You're describing potential side effects (http://www.Mayoclinic.Com/health/drug-information/dr601231) which your prescribing physician should have reviewed w/you before giving you the prescription. So go ask him/her what to do next.