How long ago was your courses?
Doing PCT generally doesnt help with Deca dick, most cases the person's bloods are fine. Once the deca is out your system and your body gets back its natural levels you will be fine.
What people don't realise is that Deca/Tren/anavar messes up your brains reward circuitry specifically dopamine. You get a blunted response to stimulus that would normally give you a high. For example sexual stimulus, cocaine, alcohol, amphetimines. You need to let your body recover over time.
You say you are wanking many times a day this makes it worse and you will soon have porn induced ED, or something similar if you are not watching porn but still wanking. Your already damaged dopamine receptors are taking a beating from the over stimulus you are providing by wanking, as this releases a stack of dopamine. Soon your body will start shutting down the dopamine receptors and you will be depreased, your normal levels of dopamine will decrease and inturn prolactin increase causing you no sexual desire.
All you need to do to stop this is stop wanking for a while. Let your body recover to normal over time. Do not test to see if you can get a hard on. Google nofap and your brain on porn to find out more. as someone already stated some people suppliment with sublutiamine, choline CDP and DHA to help them along.
I had this problem, and now on the road to recovery.
Hope this help.