When do the tantrums stop?

My oldest is 3.5 with level 1 diagnosis. The tantrums have been what feels like non-stop for months. I'm to the point where I dread waking up in the morning or getting off work because all I'm going to hear is screaming, crying, and throwing things.

Today after daycare the tantrum started because I wouldn't let them eat the stale cereal off the floor of the car.

Please tell me the tantrums are going to stop? Pretty please? Or maybe just lie to me so I can stop hiding in my bathroom and go fight the bedtime battle...

To be clear, I love them dearly, just tired! We're finally starting OT tomorrow.