Oh, I am so sorry. Welcome to the group, even if it's for such a bummer of a reason.
If you can, try to find a counselor or psychiatrist to check in with regularly. It serves a few purposes- a person to speak to about frustration, anger, coping skills that work for you specifically, help with sleep, stress management and someone that you can just lay it all out with. Family may not get it, nor be open to hearing how you are struggling. A third party and objective person can be a saviour of relationships- they are there specifically for you and do not judge. Your provincial health plan covers psychiatrists, who are medical doctors too, and can prescribe medications for you should you need. A particular kind (consultation liaison psychiatrist) can even help manage more than counseling and can be the person to help you coordinate your treatments over all.
With regards to anger management- decent sleep, a reduction in stress (easier said than done) and time will help reduce it. My anger always came when I was fatigued (still does) and I learned to recognize that I have done too much when I start to feel ragey. This is new for you, and likely you've had a hard time leading up to your diagnosis. I've found that as time goes by, it just gets better. There is a drastic change in expectations for sure- understand that you are going through a grieving process as you realize the future you had envisioned is likely not going to come to pass. That's a tough thing to swallow.
Anyhow, welcome to the group. It's a great bunch of people.
~Fiona