Thank you for posting about your situation. Even if you don't feel as though you're getting a high, please get outside professional help. Perhaps you can also talk with your family doctor and ask for blood work to rule out mineral deficiency such as iron or other health issues. (Please do NOT take iron supplements without knowing if you have anemia or not since too much iron may cause liver, the largest internal organ, or kidney damage.)For 12-step Narcotics Anonymous meetings (and the only requirement is having a desire to get sober): http://www.na.org
Seriously, it's good that you're "scared" as no one really knows when their last time from huffing will end up with someone having to plan their funeral or visit them in a physical rehabilitation center for those with BRAIN TRAUMA as with my friend who has a Traumatic Brain Injury (TBI) from huffing at age 12, now in her 30s.
Please talk with an addictions counselor. This site has counseling and treatment programs (and some offer state and/or county funding for those without health insurance): http://findtreatment.samhsa.gov/ and can click one's state of residence on the map and then continue with the search.
Alcoholics Anonymous meetings (and one may attend an "open" meeting if doesn't have a drinking problem): http://www.aa.org
This site has some common mottos pertaining to those 12-step programs such as "One day at at a time", "First things first" and "People, places and things": http://www.royy.com/toolsofrecovery.html