From all of the reading I have done and the experiences of others, I HIGHLY recommend that you start running HCG as soon as possible. Dr Swale, from allthingsmale.com, who is an endocrinologist specializing in TRT, used to suggest 250mcg 2-3 times a week. When you look at the studies done with HCG though, returning from being hypogonadal can take anywhere from 8 weeks to 8 months or longer. The longer you were on, the longer it will take to recover. Have your blood work done about every 8 weeks to see the progress.
You can take HCG and Testosterone at the same time too. Don't drop the T until you have gotten a baseline of everything and have been on the HCG for a at least 2 months, IMO.
I am not going to lie man, it's going to be rough. I stopped lifting, came off TRT levels of test, and I felt fine for about 6 months. Then it hit me one day and I realized I was depressed and didn't even realize when it started.
If I think of some other suggestions and things I recall from Dr Swale, I'll post up. It's been many years since I had read his stuff, and I am not sure if he has his info up to date anymore or if he is as active in the community.