Dvla drug test advice needed

Hi, I'm just after some advice as I can't find any specific answer on the web,

I was banned from driving in march 2016 for dangerous driving, I wasn't under the influence of anything I just had a text from my daughter that my son in law had just beaten up my daughter so lost the plot jumped into my beloved Bmw 5 series msport and lost the plot, I flew over to the flat to sort my son in law out and took a corner about 50 mph and who should be sitting there resting in his car at 3am but a traffic police man in his Bmw 5 series, I hit him head on and wrote both cars off and hence the ban for a year, I informed the police why I was driving fast and unbeknown to me my daughter had called the police on her husband and he was arrested.
He's a 6ft 6in steroid freak so he's huge and the fact I'm nearly 50 and not intimidated by him he won't front me but vowed revenge!
My ban finished on march 15 2017, when I replied for my licence the dvla told me someone had wrote into them saying I was unfit to drive as I'm a cocaine addict and inject daily (no guesses who this was) and I wad told by the dvla I need to do a medical for drug misuse to prove I'm fit to drive, I had my medical today and I know I'll pass the drugs test as I don't take any drugs, the thing I'm worried about is I'm prescribed 30mg of Valium daily for depression because my seven year old son died.
Does anyone know if this will prevent me getting my licence back and also how long until I can find out?
My ban should be up now and I'm self employed and I lost half my work because I just couldn't get there and if I don't get my licence asap I'll prob be claiming benefits soon.
Any help from someone that knows would be most helpful
Thank you in advance.