SORRY To hear about the problems , I feel the same way, that there is no understanding from GP's. I am in my 40's and have had problems with my short term memory more than long term. But even after illness and been told that I have 50% brain damage, I was referred to a memory clinic for diagnoses . this assessment was so daft that it didn't seem to be an assessment. But I have returned back to my GP and tried to discuss the problem with him, but last time has just made me give up trying to get it sorted. me and the wife went to the appointment and after explaining that it seems to be getting worse, due to forgetting way home , turning gas off after trying to cook and other daft thing ( taking into account , my wife must feel like yourself with me) he kindly told me that there wasn't a problem with the brain, until we pointed out C.T. scan and reports. he then looked at the computer and said " O , yes u have got brain damage". now this is the GP who has been treating me for about 10 years. best I can get out of him is that I shouldn't be able to do what I do. but still no help , advice on how to cope with it.
Hope you are able to find help with either another GP or just by making a stand and tell the GP that you want it sorted , make him refer you to the right team, so at least you have started the long hike of getting something done.
Jeff