A General Practitioner studies for 4 years to become a doctor, only 6 months of that time is dedicated to pharmacology. I've studied pharmacology for longer! Most semi intelligent bodybuilders have, admittedly we only really look at anaboics/androgenics/thermogenics but a GP mainly looks at pain killers, anti biotics and cold medicine!
There's no point in discussing with your GP, especially if he/she are old, because their knowledge is non existent, you need to discuss with an endocrinoligist who specialises in hormone work. But even he wont have looked at the drugs to provide the effects we're after.
Or you can speak to PScarb as he knows more than most.
www.extremenutrition.co.uk