There were a few years during which I did most of my long distance riding on a recumbent. It was fast on the flats, and comfortable, but it never felt 'normal' to me and I continued to commute on an upright bike (at that time, most of my commuting was on a folding bike).

I just said it was 'comfortable,' but nonetheless I don't think I ever really 'got comfortable' on the recumbent. Does that make any sense? It was squirrely, visibility was limited (I couldn't see behind me, even though I'm good at using a mirror; and I wasn't sure cars would see me) and my hands were always falling asleep. I especially disliked the pressure on my lower back --when my feet would press hard on the pedals, that would push my lower back against the seat. It felt fine on my feet, which are used to supporting my weight, but on my lower back it felt all wrong. So for me, anyway, switching back to the upright bike was 'back to normal' and I can't say I've missed the recumbent much at all.

Obviously you did better on the 'bent than I did! Switching back may be hard but not impossible.