Girls, hi. Since 7 months they started growing teeth, at 1.2 there wer…

Girls, hi. Since 7 months they started growing teeth, at 1.2 there were 6 teeth. The son is about to turn 1.4 and he already has 15 teeth. So in these two months, 9 teeth have come out. These were unrealistically difficult two months (The child is capricious, sometimes has diarrhea, once had a fever, and every night he sleeps poorly, for two months now. He sleeps well during the day too, but also has tantrums, but not like at night. Yesterday, the second upper molar protruded. Creams, Nurofen didn't help at all. Could these be on the teeth? Or should we still see a neurologist?