I'm truly sorry for your loss and the pain you are experiencing. Losing a parent is the most difficult and challenging experience. Its normal that you feel the wish to talk to him! While, its not practically possible to directly communicate with those who have passed, you might consider writing down your thoughts that you wish to pass on to him. This can provide a sense of relief and a way to express your emotions. Remember, healing takes time, and you're not alone in this process.
Next Steps
Please speak to a therapist with whom you can express your emotions and find ways to honor your father's memory.