You are going to go through all stages of grieving, not always in order and you will repeat them as well. It's tough and don't expect to feel like things are going to be "back to normal". Your 'normal' from this point forward is something different than what it was in the past.
BUT, now that you know what to expect in the near term, recognize that, in fact, you HAVE gone through many other life-altering events already in your past. Like when you lost your virginity, or when you first feel in love, and when you first experienced a love that was lost. Once those happened, your life changed, and you survived as as a slightly different person (and more likely, a much better or more 'complete' person than you were before!).
As others have already said, becoming HIV positive today is FAR different than it was 30 years ago, or 20 years ago, or even 5 years ago. You've got great medications which will keep your infection at such a low level that you are at low risk of ever passing it to others (just as long as you stay on your meds). The meds are easy to take and have no or very few side effects. And there are a lot of HIV- guys who routinely take PrEP to protect themselves from getting infected.
You are not alone. There are MANY of us out there who went through the same process that you are starting on. We know how tough it can be and we also want to support others who are going through it. You already have a number of respondents above who are in your area and are offering to help. And you are lucky in that you live in an area where there is not only a huge community of HIV+ guys but also supportive agencies who exist solely to help you through this time period.
Feel free to reach out to me if you'd like. I have been HIV+ for over 25 years, have had three AIDS-defining illnesses and had to stop my career due to it. That was a long time ago, and I can tell you that my 'death sentence' back then turned into a life-affirming event that allowed me to accomplish more after I became HIV+ than I ever could have imagined. BUT that only happened after I went through the same stages of grief you are experiencing now. Press on, my friend, and you WILL get through this. And, your new normal can be a pretty fantastic, even if you can't think of it as such now.
All my support,
Marc