Mommies, anyone had something similar and where is the cause? The son …

Mommies, anyone had something similar and where is the cause? The son cries every day, groans, always unhappy, but without tears in any case, when on the floor, in the crib, in the stroller. He doesn't cry only on hands. Toys lure for a couple of minutes. Two teeth popped out, others are not visible. Belly soft, breast usually takes. Gave him Nurofen - no changes. This crying is dumb 24/7. I am a bit tired.