Tandem feeding is really tough. I too had to wind back on feeds, so that i was able to continue. The changeover period was rough, but once DD got used to and accepted it, it became easier again. I also questioned whether the benefits of feeding were outweighed by how i was feeling. As DS got older, i was able to be more active and found that DD was more able to go without feeds because i wasn't sitting down in the feeding position.
I'm still not sure whether long term weaning is better than a more concentrated term of weaning. Now i am kinda at the end, i am content that i kept going, but if i was in the same position again i reckon i could also be happy stopping earlier.
take care of yourself whatever you decide.