3 yr old son diagnosed with m.r

[ttatina]

my son was born with hypothyroidism,he was treated a few days after birth,i noticed none of his milestones were being met,he never pointed,clapped his hands,said any words,never put weight on his legs to stand when he was young,and always had this glare in his eyes when he was a baby and i always felt like something was wrong,he is now three years old,he still dont talk or understand what is being said,hes really aggresive,always pulling my hair and dosent even understand what no means,when u tell him no he wants to do it more,he is currently on risperdal,ativan,synthroid,haodal,adderall,and clonodine to help him sleep.hes been going to ot/pt since he was 1,but dosent seem like it is helping him at all,he is so hyper he cant sit still at all,he is in a classroom all by himself away from the other kids due to his aggression,which we also have to stay there with him.i have had all of his mri tests,genetics testing everything always comes back ok,my son started all these meds when he was 2,his neurologists say they have never seen a child like this in all of his years of practice.at first they thought possible autism,but now they r ruling that out and telling me it looks more like m.r..since my son dosent understand what is being said does this most likely mean he will never talk.this has really took a toll on my whole family,for two years straight now ,i wake up crying everyday wishing i wouldnt wake up at all,
we r so lost and dont know what to do,all the aggression he has,no sleep,i cant even work anymore because no one can handle my son,my older children not getting the time and attention they need,it hurts me so bad inside just looking at my son wondering what happened in my pregnancy,the doctors pretty much gave up on trying to find out what happened and why,they just want to keep upping the doses on his anti psyc meds which i could just imagine what damage its doing to his little body,but without these meds he is uncontrollable with his severe aggression.i love my boy to death but i dont know how much more i can handle i really feel like i am losing it inside.is there any hope left?is anyone going through a similar situation.