Confused... advice

I came home late from work (got done at 11pm) I didn't get home till around 11:36. When usually takes me around 11:20-11:30 or so to get home.

My fiance met me at the door and asked why I was late. I told him that I was only a few minutes late and it didn't matter which he wasn't happy about it and I did say it in a bitchy/snotty kind of way. He grabbed me by my head and started to shake my head back and forth in a no and yes type fashion to his answers that he asked (ie shaking head yes to does mater that I was late getting home?) <- he's done the whole he'd holding/shaking thing before also.

I took my arm and pryed/shoved it between his arm and my head causing me to fall over from loss of his grip on my head and fall on my butt/backpack that I use for work.

I fell between 2 doors (the wall/door frame of each door in a corner of the entry way of the house) he processed to say I am an idiot and some other names (can't remember them all).

He never got this bad before, yes the shaking of the head has happened before, but never was I on the floor or anything like what happened that night.

At this point his mom (we live with his parents) came out of her room and asked what was going on. His mom was also called names like bitch and cunt etc.

His mom told him to nock it off and go to bed as his reason for going off like that was he was tired which is what he told his mom.

He told me to sleep on the couch tonight.

I went and took a shower and then proceeded to sit/lay on the couch as I was mad and wanted nothing to do with him anyway.

He came out of our room and was saying come in the room (our room) as he wanted to talk. It was 12a or so by this time. I told him no and he processed to call me names again. His mom again told him to shut up and that people are trying to sleep. He said to his mom that it was my fault for being an idiot and I don't know how to listen.

I resulted in standing in doorway of our room to talk so he would stop yelling. He asked me to stand in front of him while he sat on the bed. I argued about this for a few min and then eventually did as he asked. We talked for a bit a few times I did attempt to walk out of the room 2x during our talk but did go back and finish talking to him in the end.

His reason he told me of why he got upset was because he hadn't gotten a text from me for a while before I left and then I left late and he thought something went wrong at work or something happened on my way to work. In other words he got worried about me. Even though I did tell him when I left. He got mad cuz I wasn't texting him back right when I got the message. (which has been some arguments in the past)

After we finished talking he grabbed a blanket and went into the living room to sleep for the night.

Aprox 5-15 min after our talk was over his mom came in and asked if I was in the bedroom. Which I was, i was curled into the covers and on the far side of the bed away from the door thinking about what I wanted to do with him and how I was just treated.

He came in shortly after this and we talked a bit more.

I told him we need a break and that he need to sort things out for him and I myself. He got upset over this and told me that if we did that we wouldn't probably get back together even though I said that's not what I ment.

I eventually told him that it was supposed to be a wake up call (which it was).

I have asked him to get help, see his doc and see if they can try a different medication for him, he is currently on stratera and has been on a long time, he agrees that the medication he is on is not helping and that he shouldn't have acted that way.

He even had me make the apt for him which is set for 1/26/16!

I plan to go with him and voice my concerns to his doctor.

He told me that he will do what I ask and try and do better and not get so upset like that.

This morning we started to get into an argument somewhat and he stopped himself and asked for me to drop it.

I'm not sure if I know what to do. I love him with all my heart!

I'm not sure if I'm afraid of him though or not.

I love him yet I'm worried at what he might do next.

We've been together almost 5yrs. Will be 5yrs on July 10th 2016.

I can see the man he can be!

I need advice and not anything rude. I'm torn I don't need negative comments about my current situation. I need kind and helpful advice.

Thanks.

Ps sorry for the long post.