My beautiful Boy Logan

Im new to this so I guess i will start from the beginning. My Son was dignosed with bi-polar mood disorder and adhd at the age of 3 but it started at 2. He went from being my baby boy to a nightmare and there was nothing i could do to help him until I finally found a dr who would even give him a chance. Logan was 3 and he was screaming, slamming doors, throwing things, hitting, biting etc. I was scared for him. Logan is now almost 6 and we have been through one heck of a battle with trying all these differents medicines. They would work for a little while then after a few month he was back with the manic out lashes. I met my fiance when logan was 2 and hes been great with helping me deal with everything going on. I have a 2 year old son with him and he also has an 8 yr old daughter from a previous relationship. Its been really hard dealing with this. Logan had trouble in school and the whole adjusting thing and now that hes almost in 1st hes really behind in school with reading and stuff. He's my baby and i only want the best for him. He's birth father is not in the picture and logan doesnt even know who he is. For all he knows my fiance is his dad. His birth father has the same diagnoses as logan and doesnt care how he's doing which makes me so angry. Im soo tired all the time and i deal with horrible headaches all the time. I sit and cry a lot bc im just so tired and i dont know what else to do anymore. I cant let my baby go and i want to help him i just dont know how anymore. I dont want to see him go into a hospital or get taken away from me. Im so scared of losing him. He's my first born and he and i share a bond that i cant let be broken. Im just at wits end here. I dont know who else to talk to or where to go bc no one wants to do anything for him. my fiance works 14/14 and the 14 days hes at work its a nightmare in my house. Im so stressed out and its not fair to our other children who have to watch him do these horrible things and listen to him scream and shout. Today logan had one of his worst out lashes ever. It seemed like it lasted forever. He had 2 in one day! That never happened before. All i could do is cry as he hit me and clawed my arms up and yell at me that he's going to do what he wants. Im forever getting told things will get better and they just keep getting worse and worse. Im just at a lost4words.