Help!! My 10 mo old has never slept well but he is now waking every 1-2 hours and will only take one…

Help!! My 10 mo old has never slept well but he is now waking every 1-2 hours and will only take one good nap a day. I have always nursed him to sleep and he usually goes back down pretty quick but lately he is having a very hard time going back down. I have tried a gentle CIO method (I’m not into letting him cry alone for hours on end) but he will just cry and cry until I either get him up or nurse him. I have not slept more than a couple hours since I don’t remover when. Please, any suggestions, tricks, tips, would be greatly appreciated!