I have to admit, I had to look anhedonia up, though the similarity to hedonism gave me a clue. Again, been there, though I never called it anything but depression. There used to be a mental health flyer here with a lady at a party, and her thought bubble saying "I
should be enjoying this...". Just being unable to is hard, no emphasis needed, I hear you... I just kept doing things I knew I'd like, if I'd just felt something. After a while, it happened, (still have trouble every now and again, but considering I wanted to kick the bucket on saturday morning, and refused to stay at home on sunday in spite of pain... I just keep at it.). But I guess the other issues you have make it one complex thing.
I haven't been able to travel for years, because I feel insanely responsible for our diabetic cat (He's blind, and if he doesn't know where we are, he gets scared and depressed. All that's not good for his bloodsugars. So he knows we're always home in time for dinner. That is acceptable to our Lord and Master, Night the Cat.). So we haven't been on vacation since a weekend away about 5 years or so ago. Before that it was another weekend, and before that, our 5 day honeymoon, 9 years ago. It hasn't been much, while I used to fly to Canada and have never had the pleasure to show my husband around there. So what do we do instead? As I don't leave the house during weekdays, we do stuff in the weekend. Visit old cities, zoo's, museums, do special guided tours with actors and storytellers, cat cafe's, go to comic cons and fantasy fairs. Usually there's a lot of people in such places, but I cope by using my camera. (People scare me. If I reduce my surroundings to what I see through the view finder, I'm often okay. If I'm not okay, my husband gets me out in a hurry. Perks of being married to a tall guy who can look over crowds, and is rather attuned to my state of mind.). It's not the same as traveling abroad, not even close, but considering there's quite a few old cities and zoo's around here, it keeps us busy enough. I have a calendar filled with (often cheap) places to go, options, in case we feel like a long drive, a short one, or just not much of anything at all. There's breathers, little get-aways. Don't need a passport, and quite a few things can be cheap or free. Takes some searching sometimes, or just going for really, really early bird passes (Like a year before the event, but at 50% discount, I'm getting tickets!), but... It's better than being stuck at home. Sometimes, we've got to work with what we've got.
Probably no help at all, but couldn't help trying.

Jo