Turn to the Savior. He is able to take on the infirmities of every person, no matter how difficult it may seem. He will help you bear this if you allow Him, even as hard as it might be to let go of any grief after the death of a son.
And, perhaps more than anyone, God the Father knows how it feels to lose a son in a difficult way. Turn to Him, as well. This is all the consolation I can offer, but it's something I truly believe can mend a broken heart.
I'm sorry for your loss, brother. I'm sorry it's been so tough and I can only pray that you be given peace and comfort in this time. May the Lord bless you and your family.