Hi there...there is a similar thread to this in the pregnancy after LTTC thread, with some answers you might find useful.

All I can say is, I am struggling too, but I think we just keep going because the alternative is harder than keeping on trying. One thing I have realised is I dont have to feel positive to keep moving forward. Right now I am just living...and each day is a step forward even though I don'treally feel positive or happy...I guess the raw pain is easing, same as the raw dissapointment etc.

I think positive thinking is useful, in that it helps you mentally stay sane and find joy and hope in life. And I think a positive attitude/outlook helps attract good things into your life and certainly helps keep your body calm and relaxed and a good place for an embie to snuggle in.

All that said, I dont believe thinking positive makes or breaks whether or not you get a BFP and after that, a forever baby. I think if that's going to happen, it will happen, positive or negative thinking.

With our FET I believed it was going to work...I had acupuncture and all that, and I certainly thought positive...I talked to my embie..and then we had our BFP. Then I really really believed it was going to be our baby...I believed this was it for us. And then it wasn't. All the positive thinking in the world didn't get me anywhere. Other women have felt negative and now have a baby.

So positive thinking has its place, and can certainly help you mentally and physically....but don't worry if you don't feel super positive after your next FET. You are only human and you've been through a lot. And it won't stop you getting a BFP.
I guess try and find some way to feel happy/positive as a way for you to find more joy in life. That's my latest view on things anyway...and what I will apply to myself.