You have to be very careful about the side effects of either HCG or any other means to increase your T production. Unless you have a natural deficit of Testosterone, any outside means of production will either aromatize and give you more estrogen-like side effects (such as gyno, or cause your own body's production of Testosterone to shut down which will bring its own set of problems. I won't begin to mention the distinct possibility of liver or brain cancer due to "juicing". Look up Lyle Alzado for a little insight.
Jjety is absolutely correct about talking to an MD about your T levels. Any free advice on the internet is worth what you pay.
Screwing with you T levels by artificial means will give you side effects like acne, balding, man-boobs, at best. For the worst, take a gander at the late Lyle Alzado's video right before he died.
Think about it.
When no one answers a question, it's usually because no one knows the answer.
Your questions in particular are best answered by a doctor. If your doctor said your testosterone is low, then I'm shocked that he hasn't discussed the correct course of action for you to increase it.
You really don't want to be taking advice off the internet about this.