Hey mate
i'm not to sure what this could be so I can only offer suggestions to help enlarge you. However don't be shy in going to see a doctor, you only need to talk to him, he doesn't need to see it if you don't want him to.
I'm no doctor but it could be low blood pressure or any other circulation problem. It could be worth seeing a doc coz you don't want any long term problems down the track.
* fish oil supplements are rich in omega 3 and will help improve your circulation and brain function.
* l-arginine is an amino acid that will also increase your circulation, hence increase your size. It will also help improve your sexual function and the bonus is that it will increase your sperm count. However if you have low blood pressure I do not recommend l-arginine. This will lower your blood pressure even more.
Do your research on vitamins before you take them, you can overdose on many of them. Amino acids play a vital roll in your body functions and can also play havoc if you overdose. Supplements are not to be messed around with.
Please get advice from your doctor before you take anything. Wish I could be of more help.