Caterpillar

Weird looking caterpillar, spent four hours researching caterpillars on the Arabian gulf and I couldn’t find any that looked like this. It’s about two and a half inches long, a sort of pale olive in colour with yellowish hairs along the back and sides with three longer tufts of hairs on either side at the head. Has a ruff of black hairs in a band under the head, and a black horn looking thing at the bottom. Have no idea what this is and would appreciate it if someone could help me identify it.