Testosterone Replacement Therapy

First off, I'd like to say that I'm happy to see a men's community up and running. That's great! We men sometimes need a safe space of our own. 

So, recently I've been feeling very low. Very stressed, irritable, lacking motivation and just generally in a fog. I got some blood tests done and found out my testosterone and vitamin D levels were scarcely low. My doctor prescribed me testosterone replacement to improve my levels. I'm excited at the possibility to get back to feeling the old me. 

Has anyone had any experience with trt?