Help!!!!!

Help! When we started sleep training Asher he did WONDERFUL... until he got sick. Since then he has not slept & it's only getting worse. I'm talking waking every 10-30 minutes (no exaggeration) whimpering & crying. I let him CIO last night for over an hour & he just doesn't quit. I caved & pick him up.... even in my bed he is not sleeping. Our pedi checked him out & says it's just "snot" he's battling. Any other mommy friends been through this or something similar? I'm lost at what to do. 😔

**we literally have every Vicks vaporub product, cool mist humidifier, essential oils, saline, nose frida, 2 sound machines (3 if you count mine) ect.....no relief**