What do with toddler behavior issues

I am at my wits end. My 3 year old has behavior issues. I already had him evaluated and they said he is not autistic but might probably be adhd (could not be diagnosed since he is still developing and his behavior could be normal toddler behavior). However, my kid throws a fit when things do not go his way. If I am carrying him, he slaps me on my face. If he has something in his hands, he starts throwing it. 🤦🏻‍♀️ he was doing behavior therapy at home and his behavior somewhat improved, but lately it just seems it is an everyday issue. We qualified for behavior therapy under the early start intervention program but he is now 3 and since there is no diagnosis, insurance won’t cover it. It is taking a toll on me where I just do not want to be here anymore. We have good days, but when we have bad days, they are bad. What can I do to help my kid out? He has a speech delay and that contributes to his meltdowns as well. Please help with any advise or suggestions. 😰😕

Also, his dad and I are separated. I already told him i am burnt out. He just suggested to let him know when to come over so he can give me a 1 hour break. I am a sahm so 1 hour seemed like a joke.

To answer some of the comments:

He does know some sign language words, but that goes out the window once he gets frustrated.

I will look into the ACC device.

Responding to his tantrums, i try to leave the room but he just follows me and starts to hit me. I have tried redirecting, 2 minute time out on his bed and it does not work. I just wait until he stops with his tantrum and then he wants a hug. And sometimes I feel to give a hug is rewarding him and i don’t want him to think that is something he can continue to do.