Kiz, I'm so sorry your having a rough time. I'm not sure exactly what to offer you, except some advice on where to start. I personally think if you start with a solid feeding routine, the rest is easier to work with. For example, if you try to extend his feedings to 3 hrs apart (I can't remember his age so you might have to adjust that example), then based on that you would be able to know how much activity time he's had, and when he'd reasonably be tired. By knowing that he's fed, has a clean diaper, has had some play time, etc, then when he starts acting fussy or yawning, you'd know he's tired.
Have you had time to read about shh/pat or pu/pd? Do you swaddle, have a good sleep environment, have a wind down routine?
Let us know what other help you need.