Small penis advice due to steroids?

Hi,
About a year ago my long term girlfriend left me which put me in a bit of a state. I found the gym which helped take my mind off of things. I got very into the gym but due to how depressed i was, my life turned into the gym in an effort to try to make myself feel good again. I was given a form of dianabol, a pink tablet which i took over a course of 4 weeks.

Through this time i had no issues however a year later, and i have noticed my penis getting smaller and smaller. I only took it for four weeks and have not touched anything since. I am really concerned that my 4 weeks of taking a form of steroids may have done something to cause this?

I read somewhere that it could alter my testosterone which could cause problems in that area? Should i try and get as much testosterone in my body as possible now to help? It is really bothering me and causing me a lot of problems on a daily basis.