Mommy, I have a question for you. My son slept all night until 4 months…

Mommy, I have a question for you. My son slept all night until 4 months old, even during feedings he didn't wake up. Then as soon as the teeth started coming in, he began waking up 2-3 times a night. But over the last 2-3 days, he has been waking up every hour??? I give him porridge, mix breast milk, everything is going well, he wakes up, I think it's not about food. I don't have the strength anymore ? Before bed, we take a walk, bath, ventilate the room and bought a humidifier, what could be preventing him from sleeping peacefully like before? To which doctor should I turn? I almost cry because my