Hi Maggie... I'm so sorry hon. I know what you're going through, I really do. My wife of 18 years and I went through the same thing, where she basically just withdrew into herself for many, many months while grieving the death of her "husband." Or as she put it, grieving with the realization that she never HAD a husband. Hindsight is always 20/20 and all that.
Eventually though, she did find her way back to the world again. Heartbroken, sad, kinda bitter... but she's THERE again. We're friends, we laugh and talk again and do things together... but it's not like before. There's NO intimacy or affection whatsoever, which has made for a very lonely relationship for both of us. We never were very sexual together (I avoided it), so that wasn't a surprise. But what I didn't expect was for the affection to fall away too (a reassuring touch the arm, a hand on the back, kiss on the cheek goodbye, etc.). She simply will not touch me, and I find myself starving for physical affection now. Not sexual, but just platonic affection. So I get those feelings of isolation and loneliness, but I don't know what to do about it aside from letting things evolve for now.
As for the loneliness otherwise, what I've found helpful is to just get in the car now and then and GO. Anywhere with people. Make up some excuse, anything to get yourself OUT THERE and mingling with people. I felt terribly lonely one saturday, and decided I HAD to find this stupid Dove Body Mist, lol... and ended up going to like 5 stores all over the county looking for it. I spent probably $50 of gas to find a $2 bottle, lol... but it was an excuse to be with people, drive through crowded streets with everyone else, shop in super-crowded stores and talk to everyone there, etc. Or maybe just order a pizza during the most crowded time of day and go pick it up. Go for a walk through a crowded tourist town. Grab your camera and go hunting for beautiful things to photograph.
As for therapists, yes... I've never felt comfortable having to pay someone to talk to me. I figured that's what friends and family are for, and over time I shifted my support from my therapist to the wonderful people in my life. I was afraid I was using my therapist as an excuse to not face my issues with the people whom it affected the most. My wife would constantly ask me, "why don't you talk to ME about these things? Or call (her) Mother at least?" And ya know... she was right.
~Kate~