WOW!!!
...and I hope you managed to get some sleep too
I think its a combination of things - perhaps inconsistency in sleep training methods, not being on an age-appropriate schedule, probably some developmental things (turning) and/or teething... all of these things could be a contributing factor but moving forward, I think we can get him on a good napping schedule and use the same method to settle him, it will help him enormously!
As I type this, I hope he's sleeping and didn't fight you too long before his morning nap
Also I just want to clarify - at night, are you using the same soothing method as for naps, as in, shh/pat until he's calm (not asleep), etc... Remember if he's mantra crying, you can leave him as this is his way of learning how to self soothe but it its a real cry, you stay with him