Shell, it sounds to me as if you're just going through the normal process of continual change in taste, salivary function and various other sensory inputs post-TX. Plus over time we naturally tend to forget exactly how things tasted before the cancer and treatment, just as we forget exactly how moist or dry our mouths were - for comparison purposes.
It's easy for me to recommend that you not worry so much (I'm a worrier too), so I won't. But I will say that time will show you many different things and that as David and Paul have written, it's always in flux for us folks.
I found the only consistent taste I maintained was for sweet things. But then I've always been a sugar addict.
Take a few deep breaths, keep trying things and whenever you feel anxious come in here and talk to us!