The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
Christine, I’m so sorry you are going through this experience. We always and only recommend physiological dosing of hormones and we always start with progesterone. Since you have had a hysterectomy, you will also need estrogen, and down the road, maybe testosterone. But we always check hormone levels (not using blood serum) to determine exactly what hormones and what dosing your body needs. Pellets take at least 3 months to wear off, before getting levels checked. Why don’t you go to my website, click on “Begin Your Journey,” scroll down to the bottom where it says “type in your zip code here.” Up wil pop a list of drs who work with bhrt in your area. You will need to call those dr offices and ask if that dr works with compounding labs on personalized bhrt for his patients. When you find a dr, email me at lyn@ and I can direct your next step. When you find a dr, we can work with you over the phone to guide your next steps. Hope this info helps! Hang in there!
I think this approach is fine. I must say having been doing this for years, treating hundreds and thousands of men I have been underwhelmed with the results with topicals. Injections can cause peaks and valley and I have many younger men inject twice a week that smooths out the peaks and valleys. I think it is appropriate to follow the advice of your primary doctor and endocrinologist. I have just seen too many men spend months or years with gels with sub optimal results. Many men are diagnosed with depression and are not really depressed (I have no idea if this applies to you), but the presumed depression is base dupon low T.
My recommendation would be to pursue this but if a few months pass and results are modest consider another approach. Pellets are one approach to have smooth levels of T and are placed every 4 months.