I had to look up "anhedonia" - to understand what it was - but even before I looked it up, I felt that rachylou was onto something, and that doing something physical might help - much more than you might think.
Whenever there is something "going on" that is mind-spirit related, it's pretty tough to try and heal from the inside out. There is all this stuff out there about changing the way you think or the way you perceive things, and yet - I really believe that sometimes working from the 'outside in' is more effective and works faster than trying to change your thoughts from the inside-out.
Not sure I'm making sense here, but what I'm suggesting is that while things like cognitive behavioral therapy are excellent and work well over the longer term - when things are really bad - sometimes it's actually better to work from the outside-in. Really good food, long walks, taking 'action' in areas of your life that are bothering you and so on.
Instead of trying to hurry up and 'fix your thoughts' - you might find it faster and easier to take care of yourself from the outside in. More exercise, more fresh air, more time spent listening to your friends yak at you about their problems. You might even want to take some sort of decisive action toward a problem in your own life that has been bothering you.
The 'physical' thing? At the very least - you will feel more grounded and more at peace if you are able to sort of burn off some of the goings-on that are making your head an uncomfortable place to be.
While I definitely think counseling and therapy will help a whole lot, I also think that when things are really bad - this can take too long, and sometimes "outside in" is better than "inside out".
You want to do both - but don't discount how effective 'outside-in' can be while working on the 'inside-out' part via counseling and so forth. Pull out all the stops - it'll take awhile for counseling to work it's magic. In the meantime - listen to rachylou.... a really good way to help heal the mind is to engage your body.
Hang in there Sona - never mind frightful thoughts of hospitals or what have you - it's going to work out. You just need to find a good counselor that you like and trust, and in the meantime - you want to look after yourself as if you'd just come through some serious surgery or other illness.
Thinking of you, and hoping that this weekend brings a bit of a turnaround.