He is clearly very used to having his own way and is very angry that this didn't happen tonight. However, remember that he did obey you and didn't go out. At this point he was acknowledging your authority which is a good start.
You need to decide whether you want him to remain in your care. If you do, you need to stick this out and further establish your authority because to give in will make matters far worse. You solve nothing by sending him to your mother's or getting your boyfriend round to deal with him. By all means have your boyfriend in your house if that is what you are choosing to do anyway but this is the point at which you need to be the one standing your ground.
Tomorrow you need to get in touch with a family support worker and ask for a meeting as a matter of urgency. Then you need to explain everything that is going on and ask for help to manage it. There are training courses you can go on to learn how to restrain children safely and others to help with other aspects of behaviour management. Ask about them and make it clear that this is about keeping you and your baby safe. You can ask for a visit from the behaviour support team if your area has one. Ours sends advisors out to people's homes to help them with behaviour management issues.
If you lose some possessions in the process of dealing with this it is a small price to pay for keeping your son. If you don't gain some more control you may end up having to kick him out to keep everyone else safe. Not only that but he is going to think this is the way to treat all women and his future relationships may well be abusive.
You need to show no emotion about the tv and, as others have said, do not buy another one for a while. Read a book, play patience, talk to your boyfriend but do not vacate the living room for your DS. He needs to see that his behaviour does not reap him rewards.
You need to do everything in your power to see this through. If you don't, you are unlikely to have another chance. Then what will you do if he decides that the baby can't live with you or that he wants all of your money in three years time when he is bigger and stronger than you?
The other issue you have is that, as I said earlier, CAMHS are likely to see this as purely a behaviour management issue and not offer any other support or assessments until that improves. You need to have a decent level of control before attending your first appointment.
Tomorrow, give him an achievable way to earn time out with his friends so that he has a genuine opportunity to benefit from acknowledging your authority. I am sure that rewarding him is the last thing on your mind right now but you need to use positive reinforcement because it works better than sanctions.
You must feel very much like the only person in the world dealing with this right now but you are far from alone and there are plenty of people on this thread for you to vent at and who will support you through this.